Summary of Nutrient Data from Surface Water Quality Monitoring Information SystemNutrient Criteria Development Advisory Workgroup June 20, 2011

Texas Commission on Environmental Quality Water Quality Standards

Table 1: Stream and River Data – number of measurements for the following parameters: nitrite, nitrate, total Kjeldahl nitrogen (TKN), nitrate+nitrite (Nit+Nit) and total phosphorus (TP), and the number of sampling sites (Sites) with available data shown by basin and segment from the Surface Water Quality Monitoring Information System (SWQMIS). Data summaries include all historical sampling up to March 31, 2011. Note in table there are the following abbreviations: River as Rvr., Lake as Lk., Creek as Ck., West as W., and North as N. This summary was generated by TCEQ Data Management and Analysis Group.

ID Segment DescriptionNitrite 00615  Sites

Nitrate 00620  Sites

TKN 00625  Sites

Nit+nit 00630  Sites

TP00665  Sites

1 Canadian River 274 20 615 38 665 18 699 27 1246 38101 Canadian Rvr. Below Lk. Meredith 122 3 297 11 331 3 312 4 531 11101A Dixon Ck. 10 2 10 2 39 2 22 2 43 2101B Rock Ck. 1 1 18 8     43 2 49 8101C White Deer Ck. 2 1 8 1 2 1 7 1 15 1102A Big Blue Ck.     4 1     23 1 18 1103 Canadian Rvr. Above Lk. Meredith 109 7 131 7 231 7 117 9 316 7103A East Amarillo Ck. 10 3 18 3 19 2 57 3 57 3103B Punta De Agua Ck. 7 1 18 1 2 1 13 1 21 1103C Unnamed trib. to W. Amarillo Ck.     7 1     16 1 21 1104 Wolf Ck. 13 2 97 2 41 2 85 2 164 2199B Kiowa Ck.     7 1     4 1 11 12 Red River 671 88 1877 111 3426 109 1803 107 5503 135201 Lower Red Rvr. 17 1 134 2 148 2 88 2 197 3201A Mud Ck.         2 1 25 1 19 1202 Red Rvr. Below Lk. Texoma 99 3 142 4 224 5 128 3 370 6202A Bois D' Arc Ck.     12 2     37 3 41 3202C Pecan Bayou     6 1     33 1 34 1202D Pine Ck. 10 5 16 5 15 6 60 6 51 6202E Post Oak Ck. 4 2 23 4 4 2 58 4 72 4202F Choctaw Ck. 9 4 36 6 7 4 48 7 69 6202G Smith Ck.     6 1     35 1 36 1202H Big Pine Ck.         3 1     4 1202I Little Pine Ck.         7 1     8 1202J Sand Ck.     5 1     4 1 10 1202K Iron Ore Ck.         2 1 10 1 12 1203A Big Mineral Ck.         9 2 13 1 14 2204 Red Rvr. Above Lk. Texoma 6 1 94 3 115 2 49 3 227 3

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205 Red Rvr. Below Pease Rvr. 28 3 83 3 277 2 57 2 363 3206 Red Rvr. Above Pease Rvr. 17 1 74 1 53 1 21 1 118 1206B South Groesbeck Ck. 7 1 7 1 28 1 1 1 30 1207 Lower Prairie Dog Town Fork Red Rvr. 19 2 95 2 158 2 111 3 287 3207A Buck Ck.             17 1 9 1211 Little Wichita Rvr. 18 3 87 5 54 4 27 3 141 5214 Wichita Rvr. Below Diversion Lk. Dam 138 19 224 19 344 23 370 18 535 23214A Beaver Ck. 8 2 21 3 23 2 67 3 81 3214B Buffalo Ck. 2 1 8 1 2 1 13 1 23 1214C Holliday Ck. 2 1 2 1 2 1 3 1 2 1216 Wichita Rvr. Below Lk. Kemp Dam 4 1 55 1 187 1 20 1 239 1218 Wichita/North Fork Wichita Rvr. 26 3 84 3 540 4 29 2 605 4218A Middle Fork Wichita Rvr.         164 1     161 1219A Holliday Ck. above Lk. Wichita             4 1 4 1220 Upper Pease/North Fork Pease Rvr. 7 1 47 2 36 2 29 2 100 2221 Middle Fork Pease Rvr. 3 1 28 2 6 1 7 2 34 2222 Salt Fork Red Rvr. 80 4 84 4 147 4 107 4 234 4222A Lelia Lk. Ck. 10 1 10 1 67 1 2 1 68 1224 North Fork Red Rvr. 4 1 50 2 66 1 29 1 122 2224A McClellan Ck. 7 1 13 1 7 1 30 1 34 1225 McKinney Bayou 15 5 70 5 14 5 18 5 74 5226 South Fork Wichita Rvr. 27 3 27 2 513 5 41 3 529 5227 South Fork Pease Rvr.     3 1 3 1 3 1 6 1229 Upper Prairie Dog Town Fork Red Rvr. 68 9 97 10 126 10 77 5 181 10230 Pease Rvr. 28 3 170 3 58 3 46 3 219 3230A Paradise Ck. 2 1 8 1     33 2 35 2299A Sweetwater Ck. 6 5 56 8 15 5 53 5 105 83 Sulphur River 564 56 606 57 1013 61 482 54 1430 72301 Sulphur Rvr. Below Wright Patman Lk. 40 2 88 2 132 2 33 2 200 2302A Big Ck. 4 1 4 1     4 1 8 1302B Boone Ck.             4 1 4 1302C Anderson Ck. 23 3 23 3 15 3 4 1 27 3303 Sulphur/South Sulphur Rvr. 176 9 149 9 329 11 177 12 424 12303B White Oak Ck. 85 6 90 6 205 7 38 3 248 7303D Rock Ck. 13 1 14 1 13 1     14 1303E East Caney Ck. 9 1 9 1 5 1     9 1303F Stouts Ck. 9 1 9 1 5 1     9 1303G North Caney Ck. 4 1 4 1         4 1303H Big Ck.         4 1 4 1 4 1303I Big Ck. 4 1 4 1         4 1304 Days Ck. 64 10 111 10 52 10 54 11 144 11

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304A Swampoodle Ck. 1 1 1 1 26 3 28 3 30 3304B Cowhorn Ck. 4 1 4 1 3 2 4 1 12 2304C Wagner Ck. 9 3 8 3 2 2 6 2 14 3305 North Sulphur Rvr. 49 7 56 7 99 6 49 6 139 9305A Rowdy Ck.         4 1 4 1 4 1306 Upper South Sulphur Rvr. 47 7 20 7 84 7 38 6 86 7307A Middle Sulphur Rvr. 23 1 12 2 27 1 27 1 38 2307B Jernigan Ck.         4 1 4 1 4 1307C Pecan Ck.         4 1 4 1 4 14 Cypress Ck. 753 83 1029 88 1779 111 816 86 2200 115402 Big Cypress Ck. Below Lk. O' the Pines 144 7 175 7 241 9 87 5 323 9404 Big Cypress Ck. Below Lk. Bob Sandlin 95 6 168 7 230 11 144 9 336 11406 Black Bayou 50 9 170 9 206 9 117 8 258 9407 James' Bayou 74 14 124 14 96 14 47 13 149 14409 Little Cypress Bayou (Ck. ) 188 9 92 10 406 16 158 12 425 16401A Harrison Bayou 8 1 31 3 24 3     47 5401B Kitchen Ck. 3 1 3 1 7 1     7 1402A Black Cypress Bayou 57 7 106 7 215 8 19 7 267 8402B Hughes Ck. 4 1 4 1 8 1 3 1 8 1402C Haggerty Ck. 4 1 4 1 8 2     8 2402D Flat Ck.         4 1 3 1 4 1402E Kelly Ck.         4 1 3 1 4 1404B Tankersley Ck. 23 4 25 4 45 4 36 4 53 4404C Hart Ck. 4 4 5 4 19 5 13 4 19 5404E Dry Ck. 2 2 3 2 12 2 11 2 12 2404F Sparks Branch 2 2 2 2 2 2 2 2 2 2404I Boggy Ck.         30 1 29 1 30 1404J Prairie Ck.         30 1 30 2 31 2404K Walkers Ck.         28 2 27 2 28 2404L Swauano Ck.         8 1 8 1 8 1404M Greasy Ck.         9 1 8 1 9 1405A Big Cypress Ck. 11 1 11 1 13 1 2 1 11 1405B Panther Ck. 3 1 3 1 4 1 1 1 4 1405C Blair Ck. 4 1 4 1 4 1     4 1407A Beach Ck. 10 2 10 2 10 2 6 2 10 2407B Frazier Ck. 15 3 19 3 38 3 37 2 51 3408B Andy's Ck. 3 1 3 1 4 1 1 1 4 1408C Brushy Ck. 3 1 3 1 5 1 2 1 5 1408D Blundell Ck. 3 1 3 1 4 1 1 1 4 1409A Lilly Ck. 16 2 16 2 38 3 21 1 36 3409B South Lilly Ck. 27 2 27 2 27 2     25 2

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499A Cross Bayou     18 1         18 15 Sabine River 1829 50 2321 61 1270 72 4330 122 4322 101502 Sabine Rvr. Above Tidal 253 2 402 3 269 2 538 2 568 3502A Nichols Ck.         10 1 11 1 16 1502B Caney Ck.             32 2 4 1502D Dempsey Ck. 6 1 6 1     10 1 4 1502E Cypress Ck. 1 1 1 1 11 1 6 1 15 1503 Sabine Rvr. Above Caney Ck. 372 7 407 7 157 7 678 4 636 7503D Little Cow Ck.             4 1 4 1504C Palo Gaucho Bayou             15 1    504D Tenaha Ck.     37 1     25 1 42 1505 Sabine Rvr. Above Toledo Bend Rsvr. 516 17 637 18 241 19 935 23 926 24505B Grace Ck. 1 1 1 1 19 6 28 10 26 4505C Hawkins Ck. 7 2 7 2 7 2 22 5 17 2505D Rabbit Ck. 1 1 1 1 14 10 30 10 22 9505G Wards Ck.         12 1     12 1505H Hatley Ck. 1 1 1 1 2 2 2 2 2 2505P Irons Bayou 1 1 1 1 14 1 1 1 14 1506 Sabine Rvr. Below Lk. Tawakoni 381 6 439 7 151 5 839 16 804 12506A Harris Ck.             47 2 19 2506C Wiggins Ck.             30 2 4 1506G Little White Oak Ck.             6 1    507A Cowleech Fork Sabine Rvr. 6 2 18 3 23 2 149 8 170 6507B Long Branch             10 2    507D Hickory Ck.             5 1    507F Tidwell Ck.             5 1    507G South Fork of Sabine Rvr.     7 1     6 1 12 1507H Caddo Ck.     9 1     37 1 45 1508A Adams Bayou Above Tidal     4 4     78 4 6 2508B Gum Gully             4 1    511A Cow Bayou Above Tidal             3 1    511E Terry Gully             8 1    512A Running Ck.         130 3 25 3 130 3512B Elm Ck.         79 3 18 3 80 3513 Big Cow Ck. 93 3 137 3 33 2 160 4 175 4514 Big Sandy Ck. 107 3 102 3 73 3 197 2 201 4515 Lk. Fork Ck. 83 2 104 2 25 2 366 3 368 36 Neches River 769 83 1775 94 1483 99 2899 159 4434 153602 Neches Rvr. Below B.A. Steinhagen Lk. 174 6 265 5 388 5 365 6 549 6602A Booger Branch         4 1     4 1603A Sandy Ck. in Jasper County 13 1 47 1     54 1 84 1

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603B Wolf Ck. 12 1 12 1     53 1 49 1604 Neches Rvr. Below Lk. Palestine 179 7 441 10 398 9 185 8 637 11604A Cedar Ck. 18 1 61 1 2 1 105 2 145 2604B Hurricane Ck.             54 1 47 1604C Jack Ck.             62 2 50 2604D Piney Ck. 1 1 1 1 1 1 67 6 52 3604H One Eye Ck. in Cherokee County         1 1 2 2 2 2604L Bear Ck.             3 1    604M Biloxi Ck.         2 1 64 2 61 2604N Buck Ck.             52 1 47 1604O Caney Ck. in Trinity County             3 1    604P McManus Ck.             3 1    604Q Mossy Ck.             3 1    604R Paces Ck.             4 1    604S White Oak Ck.         3 3 3 3 3 3604V One Eye Ck. in Angelina County             8 1 8 1605A Kickapoo Ck. in Henderson County         17 2 77 7 89 7605C Cream Level Ck.             4 1 4 1605D Murchison Ck.             4 1 4 1605E Slater Ck.             4 1 4 1606 Neches Rvr. Above Lk. Palestine 31 3 84 3 134 4 32 3 201 4606A Prairie Ck. 3 3 5 4 20 3 33 4 48 4606C Black Fork Ck.     2 2 1 1     1 1606D Black Fork Ck. 3 2 14 3 5 2 32 2 44 3607 Pine Island Bayou 57 12 131 12 34 11 242 12 312 12607A Boggy Ck. 1 1 1 1 13 2 2 2 13 2607B Little Pine Island Bayou 13 2 13 2 1 1 70 4 63 3607C Willow Ck. 12 1 12 1     53 1 47 1607D Cotton Ck. 1 1 1 1 1 1 1 1 1 1608 Village Ck. 29 2 92 2 62 2 96 4 211 4608A Beech Ck. 22 2 21 2 29 2 64 2 79 3608B Big Sandy Ck. 13 1 12 1 2 1 69 2 66 2608C Cypress Ck. 13 1 12 1 10 1 47 1 52 1608D Hickory Ck. 13 1 12 1     55 1 50 1608E Mill Ck. in Hardin County         1 1     1 1608F Turkey Ck. 13 1 12 1     69 2 64 2609 Angelina Rvr. Below Sam Rayburn Rsvr. 17 1 91 1 7 1 58 1 132 1610A Ayish Bayou     34 1     53 3 70 2610G Caney Ck. in San Augustine County             4 1    610H Carrizo Ck.             4 1    610I Chiamon Ck.             4 1    

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610J Chinquapin Ck.             4 1    610K Sandy Ck. in San Augustine County             4 1    610L Turkey Ck. in San Augustine County             4 1    610M Venado Ck.             4 1    611 Angelina Rvr. Above Sam Rayburn Rsvr. 63 13 147 13 158 14 113 14 314 14611A East Fork Angelina Rvr. 15 3 15 3 55 3 41 5 71 5611B La Nana Bayou 9 5 96 5 7 5 126 7 196 7611C Mud Ck. 3 2 5 4 8 4 123 5 119 7611D West Mud Ck. 8 4 28 6 13 6 120 7 129 7611E Keys Ck. 1 1 1 1 1 1 1 1 1 1611J Beech Ck. in Nacogdoches/Rusk Co.             6 1 3 1611K Dill Ck.             5 1 2 1611L Everett Branch             6 1 3 1611M Ham Ck.             6 1 3 1611N Jones Ck.             7 1 4 1611O Sulphur Springs Branch             6 1 3 1611P Wooten Ck.             6 1 3 1612 Attoyac Bayou 6 1 75 1 12 2 114 3 181 3612A Terrapin Ck.         7 1 2 1 7 1612B Waffelow Ck.         19 3 6 3 19 3615A Paper Mill Ck. 26 3 32 3 67 3 28 3 82 37 Neches - Trinity Coastal 86 7 229 8 216 7 175 9 494 11701 Taylor/N. Fork Taylor Bayou Above Tidal 40 2 152 2 92 3 83 2 273 3701C Rhodair Gully 4 1 30 2 2 1 6 1 33 2702A Alligator Bayou and Main Canals 12 1 18 1 34 1 12 1 43 1704 Hillebrandt Bayou 30 3 29 3 88 2 72 4 143 4704A Willow Marsh Bayou             2 1 2 18 Trinity 4670 246 4952 230 8239 262 4945 249 11265 320802 Trinity Rvr. Below Lk. Livingston 350 9 730 10 993 10 154 8 1340 14802B Long King Ck. 8 1 60 1 51 1 3 1 63 1802D Menard Ck. 7 1 63 1 48 1 15 1 76 1803A Harmon Ck. 30 1 169 2 148 2 9 1 212 2803B White Rock Ck. 16 1 63 1 53 1 3 1 74 1803E Nelson Ck. 19 2 79 2 96 2 8 2 124 2803F Bedias Ck. 15 2 122 2 143 2 6 2 194 2804 Trinity Rvr. Above Lk. Livingston 465 10 585 11 863 10 507 10 1116 12804F Tehuacana Ck. 13 1 27 2 16 2 13 1 53 4804G Catfish Ck. 22 1 22 1 53 3 11 1 64 3804H Upper Keechi Ck.         2 2     2 2805 Upper Trinity Rvr. 704 22 650 22 945 22 850 22 1402 25805A Red Oak Ck.                 4 1

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805B Parsons Slough 1 1 1 1 1 1 1 1 13 1805D Fivemile Ck.                 12 1806 West Fork Trinity Rvr. Below Lk. Worth 261 7 406 5 444 8 447 9 714 9806C Big Fossil Ck. 3 1 3 1 3 1 3 1 3 1808 W. Fork Trinity Rvr. Below Eagle Mountain 14 1 65 1 18 1 14 1 65 1810 W. Fork Trinity Rvr. Below Bridgeport 34 3 99 4 100 4 42 4 172 5810A Big Sandy Ck.         26 1     26 1812 West Fork Trinity Rvr. Above Bridgeport 18 3 73 3 36 3 15 1 98 3814 Chambers Ck. Above Richland-Chambers 69 9 18 9 246 9 66 9 272 10814A Mill Ck.                 12 1814B South Fork Chambers Ck.                 12 1815A Waxahachie Ck. 17 1 6 1 17 1 17 1 17 1816A South Prong Ck.                 12 1819 East Fork Trinity Rvr. 350 28 376 33 402 31 358 31 602 31819A Duck Ck.                 4 1819B Buffalo Ck. 2 1 2 1 2 1 2 1 18 2820B Rowlett Ck. 18 1 14 2 17 1 20 1 29 2820C Muddy Ck.     27 1         26 1821A Pilot Grove Ck. 1 1 1 1 6 1 6 1 6 1821B Sister Grove Ck. 13 1 1 1 19 1 18 1 19 1821C Wilson Ck. 13 1 17 1 44 1 7 1 60 2821D East Fork Trinity Rvr. above Lk. Lavon 22 1 6 1 74 1 19 1 75 1822 Elm Fork Trinity Rvr. Below Lewisville Lk. 243 10 282 12 364 10 293 9 504 13822A Cottonwood Branch 128 5 19 4 130 5 3 3 117 5822B Grapevine Ck. 34 2 9 1 49 2 1 1 47 2822C Hackberry Ck. 111 5 24 4 134 5 17 3 127 5823A Little Elm Ck. 35 1 25 2 82 1 81 1 104 2823B Stewart Ck. 13 1 15 2 33 1 5 1 39 2823C Clear Ck.     18 1         17 1823D Doe Branch                 10 1824 Elm Fork Trinity Rvr. Above Ray Roberts 99 9 63 7 180 10 110 9 204 10825 Denton Ck. 20 2 76 2 51 2 15 2 114 2826A Denton Ck.     31 2 20 3 8 2 50 3827A White Rock Ck. 13 3 1 1 93 3 14 2 127 3828A Village Ck. 132 14 92 12 42 3 127 13 124 14829 Clear Fork Trinity Rvr. Below Benbrook Lk. 29 2 72 3 80 3 26 2 139 3831 Clear Fork Trinity Rvr. Below Lk. Weatherford 66 2 79 2 161 12 103 7 234 12831A South Fork Trinity Rvr.         10 2 2 1 10 2831B Unnamed trib. of South Fork Trinity Rvr.         2 1     2 1831C Town Ck.         2 1     2 1833 Clear Fork Trinity Rvr. Above Lk. Weatherford 23 2 53 1 55 5 37 5 98 5

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835 Richland Ck. Below Richland-Chambers Rsvr. 5 1 5 1 12 1 7 1 13 1837 Richland Ck. Above Richland-Chambers Rsvr. 1 1 1 1 17 1 3 1 25 2838A Mountain Ck. 31 1 1 1 36 1 31 1 38 1838B Sugar Ck. 7 1     31 1 32 1 32 1838C Walnut Ck. 51 1 2 1 76 1 74 1 79 1839 Elm Fork Trinity Rvr. Below Ray Roberts 38 2 9 2 38 2 38 2 44 2839A Clear Ck. 52 2 10 1 232 2 89 2 256 2840A Unnamed trib. of Jordan Ck. 23 1     24 1 23 1 24 1841 Lower West Fork Trinity Rvr. 335 16 187 19 367 14 348 16 482 22841B Bear Ck. 119 8 33 6 214 9 100 7 226 9841C Arbor Ck. 6 1     19 1 19 1 20 1841D Big Bear Ck. 9 1 9 1 40 1     41 1841E Copart Branch Mountain Ck. 4 1     29 1 32 1 32 1841F Cottonwood Ck. 29 5 13 1 74 4 95 5 89 5841G Dalworth Ck. 6 1     20 1 20 1 20 1841H Delaware Ck. 166 6 26 5 150 6 19 5 156 6841I Dry Branch Ck. 33 1 5 1 31 1 1 1 31 1841J Estelle Ck. 32 1 5 1 33 1 1 1 30 1841K Fish Ck. 22 4 7 1 61 3 75 4 74 4841L Johnson Ck. 63 5 21 2 74 4 110 5 109 5841M Kee Branch 6 1 6 1     6 1 5 1841N Kirby Ck. 7 1     29 1 33 1 31 1841O Mountain Ck. 32 4 2 1 113 4 116 4 118 4841P North Fork Cottonwood Ck. 50 2 17 1 48 2 74 2 68 2841Q North Fork Fish Ck. 7 2     31 2 33 2 32 2841R Rush Ck. 55 4 31 4 24 2 62 4 59 4841T Village Ck. 14 1 14 1     14 1 10 1841U West Irving Ck. 28 1 4 1 29 1 1 1 28 1841V Crockett Branch 8 1     33 1 33 1 33 19 Trinity - San Jacinto Coastal 101 6 149 6 132 6 67 6 257 6902 Cedar Bayou Above Tidal 101 6 149 6 132 6 67 6 257 610 San Jacinto 4312 150 13621 229 3754 162 4248 163 16016 2581002A Tarkington Bayou             14 1 14 11002B Luce Bayou 125 2 267 2 86 2 98 2 352 31003 East Fork San Jacinto Rvr. 295 5 504 6 242 5 242 4 645 61004 West Fork San Jacinto Rvr. 474 22 648 22 382 24 430 21 957 231004D Crystal Ck. 40 2 136 2 8 1 3 1 144 21004E Stewarts Ck. 32 1 129 1         118 11004F Woodsons Gully 1 1 1 1 1 1     1 11006D Halls Bayou 124 3 624 7 137 2 139 4 691 91006F Big Gulch Above Tidal     73 1         73 1

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1006H Spring Gully Above Tidal     74 1         74 11006I Unnamed Trib. of Halls Bayou     142 2 1 1 1 1 144 21006J Unnamed Trib. of Halls Bayou     73 1         74 11007A Canal C-147 trib. of Sims Bayou Above Tidal     21 1         24 11007B Brays Bayou Above Tidal 219 3 1068 13 240 4 216 3 1190 131007C Keegans Bayou Above Tidal 102 1 201 2 101 1 102 1 204 21007D Sims Bayou Above Tidal 251 3 726 8 293 4 250 4 851 81007E Willow Waterhole Bayou Above Tidal     64 1         65 11007F Berry Bayou Above Tidal     71 1         74 11007G Kuhlman Gully Above Tidal     71 1         74 11007H Pine Gully Above Tidal     71 1 1 1 1 1 75 11007I Plum Ck. Above Tidal     70 1 1 1 1 1 74 11007K Country Club Bayou Above Tidal     141 2 2 2 2 2 148 21007L Unnamed Trib. of Brays Bayou     70 1         74 11007N Unnamed Trib. of Sims Bayou     70 1         74 11007O Unnamed Trib. of Buffalo Bayou     74 1 1 1 1 1 73 21007Q Sims Bayou Above Tidal 13 1 12 1 6 1 12 1 7 11007R Hunting Bayou Above Tidal 183 4 457 6 176 6 187 6 503 61008 Spring Ck. 400 9 864 12 218 12 355 5 1001 131008A Mill Ck.             13 1 13 11008B Upper Panther Branch     72 2     71 2 190 41008C Lower Panther Branch     72 2     72 2 72 21008E Bear Branch     36 1     36 1 66 11008H Willow Ck. 23 1 113 2 1 1 24 2 113 31008J Brushy Ck.             12 1 12 11009 Cypress Ck. 838 11 1481 11 397 7 780 11 1741 141009C Faulkey Gully     75 1         74 11009D Spring Gully     74 1         72 11009E Little Cypress Ck.     73 1     13 1 85 21010A Dry Ck.         1 1     1 11010 Caney Ck. 272 3 513 3 270 3 244 5 699 51010C Spring Branch             14 1 14 11011 Peach Ck. 225 4 536 5 186 4 178 3 626 61013A Little White Oak Bayou     74 1         74 11013C Unnamed Non-Tidal Trib. of Buffalo Bayou     74 1         72 11014 Buffalo Bayou Above Tidal 208 17 842 21 299 17 202 17 983 221014A Bear Ck. 1 1 75 2 1 1 1 1 74 21014B Buffalo Bayou/Barker Rsvr. 11 1 85 2 9 1 24 1 97 21014C Horsepen Ck. 1 1 1 1 1 1 14 2 14 21014E Langham Ck.     74 1         73 11014H South Mayde Ck. 9 8 154 9 9 8 9 8 153 9

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1014K Turkey Ck. 3 3 149 5 3 3 3 3 148 51014L Mason Ck.     74 1         72 11014M Newman Branch (Neimans Bayou)     73 1 10 1     83 11014N Rummel Ck. 1 1 75 1 1 1 1 1 73 11014O Spring Branch 1 1 75 2 1 1 1 1 74 21015 Lk. Ck. 53 3 17 2 99 6 79 4 145 61015A Mound Ck. 2 2 2 2 2 2 13 1 15 21015B Caney Ck.         13 1     13 11016 Greens Bayou Above Tidal 169 15 579 16 231 11 158 15 704 161016A Garners Bayou 6 1 152 2 13 1 10 1 159 21016B Unnamed Trib. of Greens Bayou     68 1         68 11016C Unnamed Trib. of Greens Bayou 1 1 75 1 1 1 1 1 75 11016D Unnamed Trib. of Greens Bayou     147 2 10 1     158 21017 Whiteoak Bayou Above Tidal 224 14 595 18 295 15 216 13 720 191017A Brickhouse Gully/Bayou 1 1 75 2 1 1 1 1 75 21017B Cole Ck. 1 1 75 2 1 1 1 1 75 21017C Vogel Ck. 1 1 66 1 1 1 1 1 66 11017D Unnamed Trib. of Whiteoak Bayou     74 1         74 11017E Unnamed Trib. of White Oak Bayou 1 1 75 2 1 1 1 1 74 21017F Rolling Fork Ck. 1 1 29 1 1 1 1 1 29 111 San Jacinto - Brazos 332 38 1008 60 460 31 1649 68 1793 711101B Chigger Ck.             69 2 43 21102 Clear Ck. Above Tidal 208 8 456 17 161 4 656 15 636 151102A Cowart Ck. 6 6 27 6     135 4 69 41102B Mary's Ck. / North Fork Mary's Ck.     135 8     256 10 219 101102C Hickory Slough     24 1     47 1 31 11102D Turkey Ck.             24 1 7 11102E Mud Gully             55 2 20 21102F Mary's Ck. Bypass     35 2     44 2 44 21102G Unnamed Trib of Mary's Ck.     15 1     15 1 15 11103F Unnamed trib of Dickinson Bayou Tidal         10 1 10 1 10 11104 Dickinson Bayou Above Tidal 46 11 102 11 92 11 159 11 221 111104A Unnamed trib of Dickinson Bayou Above Tidal         10 1 10 1 10 11105A Flores Bayou             32 1 33 11105C Austin Bayou Above Tidal         2 2 57 2 60 41105D Brushy Bayou             6 1 7 11108 Chocolate Bayou Above Tidal 25 2 83 2 82 1 23 2 156 21110 Oyster Ck. Above Tidal 47 11 71 11 103 11 51 11 149 111113A Armand Bayou Above Tidal     60 1         63 112 Brazos 10273 498 13874 534 14804 498 4007 378 18050 555

10

1202 Brazos Rvr. Below Navasota Rvr. 264 7 387 10 143 9 103 11 280 121202H Allen's Ck. 57 1 79 1 9 1     21 11202I Bessie's Ck.     15 1 4 2     19 21202J Big Ck. 58 4 70 4 55 5 1 1 56 51202K Mill Ck. 33 3 87 4 55 2 14 3 115 31202P Pond Ck. 1 1 1 1 13 1 1 1 13 11202Q Clear Ck. 1 1 1 1 1 1     1 11203A Steele Ck. 13 4 13 4 2 1 4 3 4 31204 Brazos Rvr. Below Lk. Granbury 81 2 123 4 89 2 44 1 144 41204A Camp Ck. 9 1 9 1 27 1     30 11205B Bee Ck. 47 1 66 1            1205C Walnut Ck. 22 1 48 1            1205D Contrary Ck. 19 1 46 1            1205E Rucker Ck. 22 1 46 1            1205F Strouds Ck. 22 1 50 1            1205G Robinson Ck. 22 1 51 1            1205H Long Ck. 22 1 50 1            1206 Brazos Rvr. Below Possum Kingdom Lk. 271 11 411 11 65 7 55 4 145 71206D Palo Pinto Ck. 104 3 110 3 10 2 10 1 10 21208 Brazos Rvr. Above Possum Kingdom Lk. 215 5 366 5 173 3 36 3 291 51209 Navasota Rvr. Below Lk. Limestone 317 12 415 13 41 12 42 10 122 121209C Carters Ck. 133 5 145 5 50 4 16 5 55 51209D Country Club Branch 15 1 15 1 22 1 12 1 28 11209E Wickson Ck. 46 1 48 1 1 1 1 1 1 11209G Cedar Ck. 60 1 60 1 1 1 1 1 1 11209H Duck Ck. 135 3 136 3 28 2 1 1 27 21209I Gibbons Ck. 136 4 148 4 51 5 2 2 48 51209J Shepherd Ck. 11 1 11 1            1209K Steele Ck. 16 1 16 1            1209L Burton Ck. 43 1 38 1 1 1     1 11210A Navasota Rvr. above Lk. Mexia 44 1 40 1            1211 Yegua Ck. 99 2 125 1 28 2 34 2 76 21211A Davidson Ck. 50 2 51 2 26 1 5 2 29 21212A Middle Yegua Ck. 32 6 32 6 17 4 11 4 17 41212B East Yegua Ck. 83 3 65 3 60 2 39 2 72 21213 Little Rvr. 214 10 264 11 200 8 79 6 269 111213A Big Elm Ck. 4 1 4 1 28 1     28 11214 San Gabriel Rvr. 70 2 34 2 105 2 59 2 114 21215 Lampasas Rvr. Below Stillhouse Hollow 43 2 92 2 42 2 17 2 96 21216A Trimmier Ck. 11 1 19 1 27 1 1 1 29 21216B Onion Ck. 2 1 2 1 2 1     2 1

11

1217 Lampasas Rvr. Above Stillhouse Hollow Lk. 156 6 207 6 69 6 37 2 137 61217A Rocky Ck. 33 1 44 1 71 4 46 4 72 41217B Sulphur Ck. 166 10 196 10 156 10 2 1 160 101217C Simms Ck. 14 1 14 1            1217D North Fork Rocky Ck.         12 1 11 1 12 11217E South Fork Rocky Ck. 16 2 14 2 67 3 31 2 80 31217F Reese Ck. 9 2 9 2 10 2     10 21218 Nolan Ck. / South Nolan Ck. 660 18 793 19 183 21 682 19 270 211218B South Nolan Ck.         3 1     2 11219 Leon Rvr. Below Belton Lk. 374 8 457 12 58 12 368 12 131 121220A Cowhouse Ck. 86 2 104 2 10 2 1 1 11 21221 Leon Rvr. Below Proctor Lk. 451 19 655 19 523 19 65 14 618 191221A Resley Ck. 185 4 194 4 198 4 3 1 205 41221B South Leon Rvr. 46 1 59 2 56 1 4 1 57 11221C Pecan Ck. 23 1 31 1 5 1     7 11221D Indian Ck. 61 2 72 2 31 2 2 1 33 21221E Plum Ck. 1 1 3 1 3 1     3 11221F Walnut Ck. 51 1 58 1 19 1     17 11222A Duncan Ck. 40 2 48 2 32 2     34 21222B Rush-Copperas Ck. 39 2 41 2 6 1     7 21222C Sabana Rvr. 31 1 15 1 64 1 15 1 66 21222D Sowells Ck. 9 1 9 1 6 1     8 11222E Sweetwater Ck. 22 1 25 1 6 1     6 11222F Hackberry Ck. 5 1 5 1 2 1     2 11223A Armstrong Ck. 41 2 45 2 14 2     12 21223B Cow Ck. 5 1 5 1 4 1     3 11225A Hog Ck. 10 2 10 2 179 2     186 31223 Leon Rvr. Below Leon Rsvr. 74 4 70 4 78 2 40 3 110 41226 North Bosque Rvr. 466 15 648 15 3023 20 240 13 3128 211226A Duffau Ck. 55 1 55 1 393 2 4 1 394 21226B Green Ck. 126 8 132 8 613 4 24 9 642 101226C Meridian Ck. 54 1 63 1 198 2 5 1 198 21226D Neils Ck. 57 1 57 1 432 1 19 1 438 11226E Indian Ck.         123 1     122 11226F Sims Ck.         233 1     233 11226G Spring Ck.         168 1     168 11226H Alarm Ck.         131 1     129 11226I Gilmore Ck.         138 1     137 11226J Honey Ck.         126 1     126 11226K Little Duffau Ck.         83 1 1 1 84 11226L South Fork Little Green Ck.         1 1     1 1

12

1226M Little Green Ck.         98 1     98 11226Q Walker Branch         13 1     13 11227 Nolan Rvr. 80 10 157 10 121 11 38 10 183 111227A Buffalo Ck. 5 1 5 1 29 1 2 1 29 11229 Paluxy Rvr. /North Paluxy Rvr. 70 6 148 7 63 4 27 6 145 81232 Clear Fork Brazos Rvr. 221 22 609 27 300 21 206 22 553 241232A California Ck. 29 3 73 3 57 3 22 3 99 31232B Deadman Ck. 173 13 248 13 149 8 140 13 195 81232C Paint Ck.         15 1     14 11233A Big Sandy Ck. 7 1 9 1 4 1     4 11236A Cedar Ck. 1 1 23 1     1 1    1238 Salt Fork Brazos Rvr. 59 2 135 4 86 2 28 1 168 31238A Croton Ck. 20 1 25 1 1 1 1 1 1 11239 White Rvr. 3 1 6 2 2 1 3 1 7 21240A White Rvr. above White Rvr. Rsvr. 52 1 172 2 95 1 115 1 152 21241 Double Mountain Fork Brazos Rvr. 45 1 78 1 97 1 31 1 145 11241A North Fork Double Mountain Fork Brazos Rvr. 44 10 144 16 124 7 38 10 244 161241D

S. Fork Double Mountain Fork (FDMF) Brazos Rvr. upstream of confluence with N. FDMF     16 1         16 1

1242 Brazos Rvr. Above Navasota Rvr. 387 16 662 17 226 12 129 12 363 161242B Cottonwood Branch 46 2 36 2 21 2     18 21242C Still Ck. 69 2 60 2 12 1     12 11242D Thompson Ck. 115 2 113 2 31 2     30 21242E Little Brazos Rvr. 30 1 64 2 3 1     28 21242F Pond Ck. 64 1 60 1            1242I Campbells Ck. 12 1 12 1 1 1     1 11242J Deer Ck. 61 3 58 3 4 2 3 1 4 21242K Mud Ck. 65 1 61 1            1242L Pin Oak Ck. 53 1 50 1            1242M Spring Ck. 53 1 49 1 2 1     2 11242N Tehuacana Ck. 90 11 97 11 40 14 15 10 42 141242O Walnut Ck. 73 2 69 2 4 1     4 11242P Big Ck. 38 1 38 1            1242Q Bull Hide Ck. (unclassified waterbody) 2 1 2 1 8 2 2 1 8 21242R Cow Bayou 6 4 6 4 6 4 6 4 6 41243 Salado Ck. 157 10 227 10 163 10 106 10 218 101244 Brushy Ck. 238 24 343 24 121 25 99 25 227 251244A Brushy Ck. Above South Brushy Ck. 71 3 105 3 38 4 14 2 70 41244B Lk. Ck. 15 1 12 1            

13

1244D South Brushy Ck. 37 1 46 1 1 1 1 1 3 11245 Upper Oyster Ck. 363 29 475 29 305 29 206 27 538 291245A Red Gully 13 1 12 1 3 2 1 1 4 21245B Brown's Bayou 25 1 28 1            1245C Bullhead Bayou 28 1 31 1            1245D Unnamed trib. of Bullhead Bayou 28 1 31 1            1245E Flewellen Ck.         2 1     2 11245F Alcorn Bayou 28 1 32 1            1245I Steep Bank Ck. (unclassified waterbody) 2 1 62 1 3 2 2 1 54 21245J Stafford Run         2 1     2 11246 Middle Bosque/South Bosque Rvr. 40 7 83 8 396 7 14 5 446 91246D Tonk Ck. 1 1 1 1 156 1     158 11246E Wasp Ck. 1 1 1 1 189 2     193 21247A Willis Ck. 63 3 74 3 25 3 3 1 32 31248 San Gabriel/North Fork San Gabriel Rvr. 144 15 196 14 170 15 131 15 283 151248A Berry Ck. 6 3 14 3 32 3 4 3 33 31248B Huddleston Branch 3 1 3 1 19 1     19 11248C Mankins Branch 10 2 19 2 54 2     55 21248D Middle Fork San Gabriel Rvr. 5 1 5 1 24 2     25 21250 South Fork San Gabriel Rvr. 93 8 149 8 161 8 34 7 207 81251 North Fork San Gabriel Rvr. 67 6 36 6 103 6 68 6 118 61253 Navasota Rvr. Below Lk. Mexia 166 4 188 4 28 2 7 1 54 21254A Hackberry Ck. 141 2 20 2 141 2 141 2 141 21254B Aquilla Ck. upstream of Aquilla Rsvr. 43 1     43 1 43 1 43 11255 Upper North Bosque Rvr. 63 2 94 3 1024 4 29 2 1070 41255A Goose Branch         83 1     83 11255B North Fork Upper North Bosque Rvr.         101 1     101 11255C Scarborough Ck.         122 2     121 21255D South Fork North Bosque Rvr.         243 3     241 31255E Unnamed trib. of Goose Branch         52 2     52 21255F Unnamed trib. of Scarborough Ck.         153 1     153 11255G Woodhollow Branch         31 1     31 11255I Dry Branch         79 1     79 11256 Brazos Rvr./Lk. Brazos 27 5 163 8 92 8 24 5 231 101256A Aquilla Ck. 147 3 99 3 85 3 82 3 101 31257 Brazos Rvr. Below Lk. Whitney 62 3 113 3 45 3 3 2 75 313 Brazos - Colorado Coastal 65 11 179 12 485 22 263 24 646 271302 San Bernard Rvr. Above Tidal 30 2 128 3 281 8 165 11 424 121302A Gum Tree Branch         56 1 39 1 56 11302B West Bernard Ck. 1 1 1 1 36 3 23 4 41 41302C Coushatta Ck.         13 1 11 1 13 1

14

1305 Caney Ck. Above Tidal 30 6 46 6 95 7 21 5 108 71305A Hardeman Slough 4 2 4 2 4 2 4 2 4 214 Colorado 5298 269 6316 308 11548 366 11437 403 13813 3971402 Colorado Rvr. Below La Grange 874 8 961 9 1474 15 1444 15 1589 161402A Cummins Ck. 93 1 107 1 225 5 217 5 236 51402B Allen Ck.         1 1 1 1 1 11402C Buckners Ck. 8 1 8 1 49 4 7 3 48 41402D Cedar Ck.         1 1 1 1 1 11402F Blue Ck.         4 1 4 1 4 11402H Skull Ck. 8 1 8 1 45 3 5 2 47 31403A Bull Ck. 218 7 134 8 398 9 421 9 400 91403B West Bull Ck.         24 2 34 2 24 21403D Barrow Preserve Trib.     18 1 19 1 1 1 19 11403E Stillhouse Hollow     22 1 22 1     22 11403F Bull Ck. Trib. 3     25 1 27 1 1 1 27 11403G Tanglewood Trib. to Bull Ck.     21 1 20 1     21 11403H Bull Ck. Trib. 6     22 1 43 2 48 2 46 21403I Bull Ck. Trib. 5     21 1 31 1 28 1 31 11403J Spicewood Trib. to Shoal Ck.     22 1 48 1 27 1 49 11403K Taylor Slough South 3 1 3 1 11 1 33 1 12 11403L Running Deer Ck. 3 1 3 1     14 1    1403P Bee Ck. 3 1 3 1     25 3    1403R WestLk.-Davenport Trib. to Lk. Austin 3 1 3 1 21 1 44 1 21 11404A Hamilton Ck. 8 1 8 1 38 1     39 11404B Cow Ck. 9 1 9 1 42 3 4 1 43 31404C Long Hollow Ck.     8 1 8 1     8 11404D Lick Ck.         1 1     1 11406A Sandy Ck. 96 1 97 1 192 2 185 2 190 21407A Clear Ck.         21 1 21 1 21 11409 Colorado Rvr. Above Lk. Buchanan 68 2 71 2 178 3 162 3 242 31409A Cherokee Ck. 3 1 3 1 25 1 23 1 26 11410 Colorado Rvr. Below O. H. Ivie Rsvr. 168 5 276 5 396 8 333 5 439 81412 Colorado Rvr. Below Lk. J. B. Thomas 35 6 46 5 147 7 272 9 227 71412B Beals Ck. 20 3 100 5 46 4 192 5 215 51412C Deep Ck. 44 6 51 6 38 4 43 6 52 61414 Pedernales Rvr. 246 23 360 27 667 31 558 31 771 341414B Cypress Ck. 9 1 9 1 50 1 5 1 53 11414C Live Oak Ck. 2 1 2 1 8 3 8 3 8 31414D Miller Ck. 2 1 2 1 13 3 9 3 13 31415 Llano Rvr. 325 13 444 18 845 22 597 23 966 271415A Johnson Fork Ck. 5 2 5 2 32 2 12 2 33 2

15

1415C James Rvr. 1 1 1 1 15 1 15 1 15 11416 San Saba Rvr. 145 3 243 3 293 4 285 4 397 41416A Brady Ck. 7 1 12 2 82 4 28 4 85 41416C Brady Ck. above Brady Ck. Rsvr.     2 1 12 3 12 3 12 31417 Lower Pecan Bayou 14 1 18 1 113 1 106 1 126 11418A Hords Ck. 10 1 14 1 22 2 14 2 30 21418B Jim Ned Ck.     12 1 5 1     17 11420 Pecan Bayou Above Lk. Brownwood 12 3 35 3 72 3 12 3 95 31421 Concho Rvr. 153 16 407 17 325 17 367 18 641 191421A Dry Hollow Ck. 2 1 20 1 2 1 25 1 21 11421B Kickapoo Ck. 4 1 14 1 4 1 21 1 15 11421C Lipan Ck. 4 1 9 1 4 1 16 1 14 11421D Little Concho Rvr. 1 1 14 1 1 1 1 1 1 11423A Spring Ck. 21 4 118 5 34 4 71 5 150 51423B Dove Ck. 2 1 55 1 4 1 24 1 63 11424 Middle Concho/South Concho Rvr. 16 1 124 4 61 1 60 3 191 41424A West Rocky Ck. 7 1 13 1 15 1 31 1 36 11424B Cold Ck.             20 1 20 11425A North Concho Rvr. 5 2 29 4 20 3 55 5 83 51426 Colorado Rvr. Below E. V. Spence Rsvr. 12 2 72 4 61 3 379 10 252 71426B Elm Ck. 16 3 59 4 33 3 79 3 105 41426C Bluff Ck.             29 1 14 11426D Coyote Ck.             30 1 14 11427 Onion Ck. 448 24 540 24 1008 28 859 28 1076 281427A Slaughter Ck. 48 4 8 4 96 4 67 4 101 51427B Williamson Ck. 295 6 139 6 352 9 314 7 348 91427C Bear Ck. 51 3 9 3 76 4 48 3 78 41427D Boggy Ck.         9 1 9 1 9 11427E Marble Ck.         14 1 14 1 14 11427F Rinard Ck.         16 1 16 1 16 11427G Granada Hills Trib. to Slaughter Ck. 3 1 3 1     10 1    1428 Colorado Rvr. Below Town Lk. 528 13 530 13 890 13 803 13 966 131428A Boggy Ck. 80 1 13 1 87 1 82 2 87 11428B Walnut Ck. 118 8 25 9 243 11 312 11 228 121428C Gilleland Ck. 22 9 23 10 140 11 129 10 140 111428D Little Walnut Ck. 4 1 4 1 8 2 10 3 8 21428E Fort Branch Ck.             1 1    1428G Wells Branch         4 1 4 1 4 11428J Harris Branch 1 1 1 1 1 1 1 1 1 11429A Shoal Ck. 129 1 3 1 143 1 133 5 145 11429B Eanes Ck.         1 1     1 1

16

1429C Waller Ck. 4 4 4 4 112 4 126 4 120 41429D East Bouldin Ck.         1 1 7 5 1 11429F Blunn Ck.         2 2 10 4 2 21430 Barton Ck. 278 16 81 15 864 18 751 19 881 181430B Tributaries to Barton Ck. 40 18 46 20 37 4 330 22 36 41431 Mid Pecan Bayou 40 10 185 11 195 13 154 12 249 131432 Upper Pecan Bayou 15 3 56 3 63 4 11 3 107 41434 Colorado Rvr. above La Grange 509 13 503 15 726 24 710 22 782 251434B Cedar Ck.         72 1 67 1 71 115 Colorado - Lavaca Coastal 68 3 105 3 93 3 156 9 270 101502 Tres Palacios Ck. Above Tidal 68 3 105 3 93 3 156 9 270 1016 Lavaca 228 8 441 15 268 15 427 18 798 241602 Lavaca Rvr. Above Tidal 88 2 186 4 116 10 141 4 328 101602B Rocky Ck. 4 2 29 3     8 3 33 31604A East Mustang Ck.     30 1     28 1 51 11604B West Mustang Ck. 68 2 39 2 69 2 98 2 110 21604C Sandy Ck. 61 1 30 1 61 1 93 4 104 41605 Navidad Rvr. Above Lk. Texana 7 1 127 4 22 2 59 4 172 418 Guadalupe 846 110 5231 168 1910 142 3184 134 6890 1921802 Guadalupe Rvr. Below San Antonio Rvr. 87 1 205 1 85 1 133 1 348 11803 Guadalupe Rvr. Below San Marcos Rvr. 54 6 355 9 101 6 132 8 537 101803A Elm Ck.         69 4 18 2 67 41803B Sandies Ck.     83 2 159 9 49 2 296 91803C Peach Ck.     99 3 26 3 56 2 193 31803D Salty Ck.         2 1     2 11803E Little Elm Ck.         2 1     2 11804 Guadalupe Rvr. Below Comal Rvr. 126 6 422 11 306 12 186 9 760 121804A Geronimo Ck. 13 2 93 3 23 2 59 3 181 31806 Guadalupe Rvr. Above Canyon Lk. 204 32 1336 36 193 29 1143 37 736 361806A Camp Meeting Ck. 5 1 70 1 21 2 80 1 64 21806D Quinlan Ck. 2 1 43 1 1 1 49 1 3 11806E Town Ck. 5 2 50 2 2 2 50 2 2 21806G Verde Ck. 6 1 51 1 1 1 70 1 18 11806H Big Joshua Ck.         1 1 8 1 9 21807 Coleto Ck. 41 1 277 4 83 2 85 2 419 41807A Perdido Ck.     12 1         12 11808 Lower San Marcos Rvr. 28 2 302 5 108 6 92 4 472 71809 Lower Blanco Rvr. 25 8 79 8 62 8 26 8 119 81810 Plum Ck. 45 15 336 39 129 19 128 15 503 391811 Comal Rvr. 29 5 206 5 89 6 70 5 337 61811A Dry Comal Ck. 1 1 86 2 19 1 48 1 170 2

17

1812 Guadalupe Rvr. Below Canyon Dam 63 6 279 7 210 7 75 3 501 81813 Upper Blanco Rvr. 46 5 321 8 109 9 160 9 521 101814 Upper San Marcos Rvr. 14 3 72 4 34 3 35 3 115 41815 Cypress Ck. 11 1 205 4 33 3 73 3 277 41816 Johnson Ck. 12 3 94 3 16 1 97 3 71 31817 North Fork Guadalupe Rvr. 10 3 66 3 13 1 119 3 77 31818 South Fork Guadalupe Rvr. 19 5 89 5 13 1 143 5 78 519 San Antonio 7109 245 15116 280 6761 228 5112 215 10726 2811901 Lower San Antonio Rvr. 1023 16 1331 16 903 13 434 13 1308 171901A Escondido Ck. 4 1 4 1 4 1     4 11901B Cabeza Ck. 8 1 8 1 8 1     8 11901C Hord Ck. 3 1 3 1 3 1     3 11901D Lost Ck. 3 1 3 1 3 1     3 11902 Lower Cibolo Ck. 472 30 534 31 420 27 309 25 627 311902A Martinez Ck. 300 12 770 13 129 10 353 12 375 131902B Salatrillo Ck. 139 6 583 7 69 6 180 7 193 71903 Medina Rvr. Below Medina Diversion Lk. 441 17 917 17 607 14 402 17 943 161905 Medina Rvr. Above Medina Lk. 143 7 277 8 124 6 93 7 246 81905A North Prong Medina Rvr. 27 1 27 1 27 1     27 11906 Lower Leon Ck. 234 9 1090 18 359 15 158 15 547 181907 Upper Leon Ck. 45 6 38 6 64 5 42 3 70 61908 Upper Cibolo Ck. 50 9 351 9 204 9 96 8 293 101910 Salado Ck. 871 30 1720 32 707 23 567 28 1250 311910A Walzem Ck. 30 1 32 1 1 1 17 1 33 11910B Rosillo Ck. 21 3 322 4 2 2 10 3 44 41910C Salado Ck. Trib. 1 1 1 1 1 1 1 1 1 11910D Menger Ck. 1 1 1 1 1 1 1 1 1 11910E Beitel Ck. 1 1 1 1 1 1 1 1 1 11911 Upper San Antonio Rvr. 2632 45 5434 57 2258 39 2033 39 3667 571911A Olmos Ck. 47 1 2 1 54 1 47 1 54 11911B Apache Ck. 80 6 82 6 78 6 2 2 77 61911C Alazan Ck. 86 5 457 5 86 5     93 51911D San Pedro Ck. 91 7 287 8 77 7 13 1 80 81911E Sixmile Ck.     8 1         9 11912 Medio Ck. 145 5 227 5 192 5 117 5 229 51912A Upper Medio Ck. 97 12 314 14 152 15 105 13 198 161913 Mid Cibolo Ck. 114 10 292 13 227 11 131 12 342 1220 San Antonio - Nueces Coastal 100 16 155 17 116 16 167 16 299 172002 Mission Rvr. Above Tidal 57 1 108 1 72 1 93 1 207 12004 Aransas Rvr. Above Tidal 30 13 33 14 34 13 64 13 71 142004A Aransas Ck. 11 1 11 1 8 1 8 1 18 1

18

2004B Poesta Ck. 2 1 3 1 2 1 2 1 3 121 Nueces 774 58 1543 64 1668 70 1212 71 3222 902102 Nueces Rvr. Below Lk. Corpus Christi 29 3 29 3 28 2 85 3 107 32104 Nueces Rvr. Above Frio Rvr. 25 2 115 2 59 4 76 2 216 42105 Nueces Rvr. Above Holland Dam 14 2 90 2 88 3 7 2 168 32106 Nueces/Lower Frio Rvr. 146 3 161 3 119 3 244 5 352 52107 Atascosa Rvr. 50 4 137 4 145 15 100 11 286 152108 San Miguel Ck. 29 2 75 2 31 2 59 2 126 22109 Leona Rvr. 36 7 132 10 112 4 43 8 246 112110 Lower Sabinal Rvr. 24 1 83 1 63 1 19 1 135 12111 Upper Sabinal Rvr. 62 2 85 3 128 2 57 2 192 32112 Upper Nueces Rvr. 64 9 249 11 263 13 212 11 416 152113 Upper Frio Rvr. 67 5 93 5 232 6 53 5 306 62114 Hondo Ck. 45 1 61 1 112 2 36 1 163 22115 Seco Ck. 65 10 69 10 98 6 61 10 161 122117 Frio Rvr. Above Choke Canyon Rsvr. 118 7 164 7 190 7 160 8 348 822 Nueces - Rio Grande Coastal 173 36 253 38 801 51 471 51 996 562202 Arroyo Colorado Above Tidal 139 30 189 30 667 46 385 43 807 462202B Unnamed Ditch Trib. B to S. Arroyo Colorado 1 1 1 1 20 1 20 1 20 12202C Unnamed Ditch Trib. C to S. Arroyo Colorado 2 1 2 1 21 1 21 1 21 12204 Petronila Ck. Above Tidal 31 4 60 5 93 3 44 5 147 72204B Unnamed Trib. (B) to Petronila Ck.     1 1     1 1 1 123 Rio Grande 1166 117 4097 131 4167 134 2678 137 9449 1682302 Rio Grande Below Falcon Rsvr. 188 10 790 11 693 14 774 11 2000 142302A Arroyo Los Olmos 15 1 39 1 23 1 11 1 56 12304 Rio Grande Below Amistad Rsvr. 308 40 1285 41 770 44 683 48 2659 522304B Manadas Ck. 1 1 1 1 4 1 15 1 22 12306 Rio Grande Above Amistad Rsvr. 71 6 395 10 458 8 268 9 1065 142306A Alamito Ck. 4 1 8 1 38 1 4 1 47 12307 Rio Grande Below Rvr.side Diversion Dam 82 7 207 7 418 9 228 12 773 132308 Rio Grande Below International Dam 125 6 176 6 127 8 71 6 246 82309 Devils Rvr. 28 3 79 4 182 3 26 2 254 42309A Dolan Ck. 4 1 4 1 46 1 1 1 47 12310 Lower Pecos Rvr. 57 6 164 9 318 7 72 5 460 102310A Independence Ck. 15 2 36 2 70 2 15 2 95 22311 Upper Pecos Rvr. 113 23 517 25 489 21 159 24 829 262313 San Felipe Ck. 33 3 105 4 83 3 34 3 179 42314 Rio Grande Above International Dam 120 5 284 5 371 5 198 6 518 6

19

Table 2: Estuary Data - counts of samples for the following parameters: nitrite, nitrate, Nit+Nit, TKN, calculated total nitrogen (TN) calc., TP, chlorophyll a spectrophotometric (Chl a 32211) and fluorometric data (Chl a 70953); the number with samples (Sites); number representative sites (Rep. Sites) that have 20 or more samples of at least one parameter; organized by segment from the Surface Water Quality Monitoring Information System SWQMIS. Samples include historical data up to December 20, 2010. Note Lake is abbreviated as Lk. in the table. This data was generated by TCEQ Data Management and Analysis, and counts were generated by WQS staff.

ID  Segment Name Sites

Rep. Sites

Nitrite00615

Nitrate00620

TKN 00625

Nit+Nit00630

TN Calc.

TP00665

Chl a 32211

Chl a 70953

2421 Upper Galveston Bay 39 5 292 591 497 356 200 1017 729 1112421A Clear Lk. Channel 1 1       37   8    2422 Trinity Bay 41 1-4 166 416 536 155 171 855 598 1282423 East Bay 16 1 48 125 202 69 79 305 202 522424 West Bay 38 2-4 127 371 369 342 213 679 420 692424B Lk. Madeline 1       64   35 23  2424D

Offatts Bayou 5 1 35 58 41 97 28 148 106  

2424E English Bayou 1 17 76   18   62    2424F Crash Basin 2       44   14    2425 Clear Lk. 6 4 250 411 100 414 59 558 373 132426 Tabbs Bay 4 1 34 82 26 70 26 155 84  2426C Goose Ck. Tidal 1       24   64    2427 San Jacinto Bay 4 1 40 87 35 93 27 226 112 42428 Black Duck Bay 2 2 17 61 15 50 15 129 71  2429 Scott Bay 2 1 25 72 22 58 22 141 73  2430 Burnet Bay 3 1 29 77 35 57 26 153 79 42431 Moses Bay 3 1 15 69 51 67 18 149 88 132431B Deawall Lagoon 1       26        2432 Chocolate Bay 4 1 26 94 43 94 28 180 127 32433 Bastrop Bay Oyster Lk. 2 1 13 51 15 20 14 58 38  2434 Christmas Bay 5 2 40 82 73 39 37 136 94 192435 Drum Bay 1 1 13 41 14 20 15 47 31  2435A Nicks Cut 1 8 8 7 8 7 8 8  2436 Barbours Cut 2 1 20 68 9 45 9 129 38  2437 Texas City Ship Channel 9 1 32 82 66 114 28 210 86 132438 Bayport Channel 4 1 23 81 62 19 26 128 80 192439 Lower Galveston Bay 63 3-5 266 731 836 464 363 1369 874 1612441 East Matagorda Bay 3 1 46 92 53 46 20 136 104 152441A  Unclassified Tributary 1     4 3   4 4  2442 Cedar Lk.s 1 1 12 75 18 25 17 86 50  

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ID  Segment Name Sites

Rep. Sites

Nitrite00615

Nitrate00620

TKN 00625

Nit+Nit00630

TN Calc.

TP00665

Chl a 32211

Chl a 70953

2451 Matogorda Bay Powder / Horn Lk. 11 4-5 195 350 247 209 112 534 421 612452 Tres Palacios Bay Turtle Bay 6 1 68 118 73 52 35 162 128 422452A Tres Palacios Harbor 2 0-1 35 52 62 38   99 81 342453 Lavaca Bay / Chocolate Bay 9 3 136 264 209 190 95 426 323 922453B Lyuns Bayou Basin 1 0-1 23 40 13 34   50 48  2453D

Lavaca Bay Ship Channel Area 1 0-1 56 89 70 60   142 119 23

2454 Cox Bay 1 1 54 102 70 58 29 158 125 152455 Keller Bay 2 1 49 80 71 55 31 135 112 152456 Carancahua Bay 4 1 62 93 82 51 39 144 121 162461 Espiritu Santo Bay 2 2 62 113 97 63 39 191 140 292462 San Antonio Bay / Hynes Bay / Guadalupe

Bay / Mission Lk.5 4 129 268 77 166 47 357 273 39

2463 Mesquite Bay / Carlos Bay / Ayres 2 1 51 97 62 52 24 149 121 152471 Aransas Bay 27 1-2 59 112 138 61 35 231 186 362471A  Unclassified Tributary 1 1 1 22     23 8 152472 Copano Bay / Port Bay / Mission 33 1-4 158 284 175 269 67 531 373 972473 St. Charles Bay 2 1 38 137 115 163 107 196 163 232481 Corpus Christi Bay 75 2-6 243 438 391 258 131 769 641 892482 Nueces Bay 20 4-5 187 343 229 207 103 508 433 462483 Redfish Bay 13 1 55 181 164 190 132 262 230 232483A Conn Brown Harbor 2 0-1 32 65 15 59   95 94  2484 Corpus Christi Inner Harbor 13 3 200 327 205 215 86 482 419 482485 Oso Bay 6 2 68 128 142 178 87 289 255 242485A Oso Ck. 1 1 8 24 17 10   43 44  2491 Laguna Madre 84 7 275 597 595 455 332 1109 928 1232492 Baffin Bay / Alazan Bay / Cayo del Grullo /

Laguna Salada64 2 98 179 190 168 109 343 302 34

2493 South Bay 1 1 41 97 84 39 36 160 122 232494 Brownsville Ship Channel 3 2 39 101 131 34 46 199 151 362494A Port Isabel Fishing Harbor 2 0-1 21 40 43 24   78 59 12

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