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Shirley Basin Reservoir
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WYOMING DEPARTMENT OF ENVIRONMENTAL QUALITYWATER QUALITY DIVISION
MONITORING AND ASSESSMENT REPORT
WATERBODY: Shirley Basin Reservoir - WYNP10180005
CLASS: Class 3B
DESIGNATED USES: Aquatic life other than fish, primary contact recreation, wildlife, industry,agriculture, and scenic values
1996 305(b) REPORT AND303(d) LIST.
Though classified as 3B, this waterbody was listed as partially supportive forcold-water fisheries uses. Impairment suspected to be caused by nutrients andsedimentation. Sources were reported as rangeland.
AUTHOR: Eric Hargett
INTRODUCTION
WATERBODY - Shirley Basin Reservoir (SBR) is a small impoundment located northwest of Medicine Bow, Wyoming
in northern Carbon County. SBR is a public waterbody surrounded by land operated by the Bureau of Land Management
(BLM). Estimated mean depth of SBR is around 8.5 feet with a maximum depth of 15 feet. Total surface area of the
lake is 0.31 mi2 (17 acres). The reservoir receives inflows from three unnamed intermittent streams. Water that flows
over the spillway will enter an unnamed drainage that is tributary to Muddy Creek. The entire SBR watershed is located
in the Wyoming Basin level III ecoregion (Omernik and Gallant 1987) and the Rolling Sagebrush Steppe level IV
ecoregion (Chapman et al. 2003). The watershed is largely comprised of marine deposits from the Steele Shale (USGS
1985). The quality of water in SBR and its tributaries is influenced by the surrounding geology which can result in
elevated conductivity and total dissolved solids. Soils and geology in the watershed are erodible and streams in the area
may carry large sediment loads in response to precipitation events. Primary uses on or near SBR are recreation
(predominantly angling and camping) and wildlife habitat. Secondary uses are livestock grazing.
WYPDES PERMITTED FACILITIES
No permitted facililties discharge into SBR.
REPORT OBJECTIVE
The State of Wyoming’s 1996 305(b) Report and 303(d) List indicated that SBR was partially supportive for cold-water
fisheries uses. However, the current 3B classification of SBR does not list cold-water fisheries as a designated use. The
Wyoming Department of Environmental Quality - Water Quality Division (WDEQ/WQD) conducted an assessment of
SBR in July 2002. Additional data used in this report include information gathered by the Wyoming Game & Fish
Department (WGFD). The purpose of this report is to present the findings of the 2002 WDEQ/WQD assessment,
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evaluate available WGFD information, and provide a determination of whether designated uses assigned to SBR are
supported.
METHODS AND MATERIALS
All collection, analysis, and evaluation of SBR data was conducted in accordance with approved assessment procedures
as outlined in the following documents:
1) Manual of Standard Operating Procedures for Sample Collection and Analysis. (WDEQ/WQD 2001a).
2) Quality Assurance Project Plan (QAPP) for Beneficial Use Reconnaissance Project (BURP) Water Quality
Monitoring. (WDEQ/WQD 2001b).
3) Wyoming’s method for determining water quality condition of surface waters. (WDEQ/WQD 2002).
Vertical profiles for dissolved oxygen, specific conductance, temperature, and redox potential were measured with a YSI
600XLM multi-parameter SONDE probe lowered to desired depths.
WDEQ/WQD ASSESSMENT STATIONS
Descriptive information and data collected on SBR assessment stations (Map 1).
Station ID ChemicalData
PhysicalData
Legal (Sec / T / R) Latitude Longitude Elevation(ft)
Pelagic YES NO SENW of Sec. 12,T26N, R80W
42° 14' 25.65" -106° 22' 08.11" 7010
Littoral North YES YES NENW of Sec. 12,T26N, R80W
42° 14' 33.87" -106° 22' 11.64" 7010
Littoral SE YES YES SENW of Sec. 12,T26N, R80W
42° 14' 25.37" -106° 22' 05.45" 7010
Qualitative habitat, chlorophyll ", depth profiles, and water chemistry data were collected at the above stations on
7/23/2002.
CHEMICAL DATA
Data described in the following paragraphs can be found in Table 1 and Figure 1. Although SBR is currently classified
as 3B, all water quality data will be compared to the numeric criteria that is protective of cold-water fisheries uses
applicable to class 2AB and 2B waters. Where applicable, comparisons of SBR data to class 3B criteria are also
provided. Water temperatures at the deepest location in the reservoir were either slightly above or below the
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WDEQ/WQD (2001) maximum criteria of 20°C for a cold water fishery. Water temperatures within the littoral areas
generally exceeded this numeric temperature criterion, though were expected because of the shallowness of these areas
coupled with direct insolation. Ambient pH at all stations was above the upper limit of 9.0 (WDEQ/WQD 2001).
Considering there are no anthropogenic sources in the watershed that could influence pH, the high pH is believed to be
caused by elevated photosynthetic rates from aquatic macrophytes and phytoplankton which is supported by the high
dissolved oxygen concentrations in the upper water column. Under these conditions, photosynthetic organisms will
deplete available free CO2 and will use dissolved carbonates and bicarbonates (released from sediments and organic
matter through decomposition, geology, humic soils) as their source of carbon. The production of hydroxyl ions from
the photosynthesis of these carbon sources can be responsible for increases in lake pH that may exceed 10 in late
morning to late afternoon in lakes undergoing high photosynthetic rates (Cole 1994, Wetzel 1983). Considering the pH
of SBR was measured within this time period in the presence of phytoplankton and aquatic macrophyte beds, this
explanation makes sense.
All sites were characterized by an oxidizing environment. Though SBR is subject to intensive wind mixing, the reservoir
may be dimictic and appeared to be weakly stratified near the dam as evidenced by the clinograde profiles for
temperature, dissolved oxygen, and conductivity. In littoral regions and the epilimnion of the Pelagic site, dissolved
oxygen concentrations were above the acceptable one-day minimum dissolved oxygen criterion of 8 mg/L that is
protective of cold-water fisheries (WDEQ/WQD 2001). Dissolved oxygen concentrations in the hypolimnion were less
than 8 mg/L though expected for a weakly stratified reservoir. High dissolved oxygen in the littoral regions was due to
super-saturation from aquatic macrophytes. Conductivities ranged from 4861 to 5371 uS/cm and were expected with
a watershed comprised of erodible marine deposits. SBR exhibited a reverse chemocline or steep salinity gradient where
the epilimnion was more saline than the lower hypolimnion. This indicates SBR was receiving an influx of saline water
that had not had sufficient time to completely mix in the reservoir. The three streams that feed SBR were flowing on
the day of the assessment and likely delivered the saline water to the epilimnion. The lake was pale green in color which
was attributed to suspended algae. Lake transparency in July 2002 was optimal with Secchi disk readings at or near
reservoir depth.
Total phosphorous and nitrate-nitrogen concentrations at all stations were below detection levels (<0.1 mg/L). Recent
guidance by the United States Environmental Protection Agency (USEPA 2000) recommends that total-phosphorous
and nitrate-nitrogen concentrations less than 0.01 and 0.05 mg/L, respectively, may be protective of aquatic life uses for
lakes and reservoirs in the Wyoming Basin ecoregion. Because of the high detection limits, it is unknown whether total
phosphorous and/or nitrate-nitrogen concentrations at all sites were below the federally recommended nutrient criteria.
Ammonia concentrations at all sites were either non-detect (<0.1 mg/L) or detectable but below the pH and temperature-
Shirley Basin Reservoir
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dependent ammonia chronic criterion (<0.389 mg/L) that is protective of early life stages for aquatic life when salmonids
are present (WDEQ/WQD 2001). Chlorophyll " ranged from 2.1 to 3.3 mg/m3 and were greater than the federally
recommended minimum chlorophyll " concentration (spectrophotometrically derived) of 1.4 mg/m3 (USEPA 2001).
These results may be suggestive of nutrient enrichment, though these recommended criteria were developed for a broad
region and may not be applicable to SBR.
The Carlson Trophic State Index (TSI) is a quantitative method used to classify and assess general water quality of a lake
(Carlson 1979). The index is a measure of the trophic status of a lake or reservoir using several measures of water
quality including: Secchi disk transparency, chlorophyll " concentrations, and total phosphorous levels. TSI ranges
along a scale of 0 (ultra-oligotrophic) to 100 (hyper-eutrophic). The total phosphorous TSI considers SBR to be near
hyper-eutrophic. However, these values are not representative of trophic status because the detection limit (0.1 mg/L)
was used in the calculation which results in an overestimation of trophic status. The Secchi TSI was initially developed
for small lakes with depths greater than thirteen feet and is therefore not applicable to the Littoral North and Littoral SE
sites even though they exhibited maximum water transparency. The Secchi TSI value of 40 for the Pelagic site (4 meters
depth) indicated SBR is mesotrophic. This trophic status is supported by the mean chlorophyll " TSI of 40, which also
indicates mesotrophic conditions. Lakes with this trophic status are generally characterized by moderately clear water,
adequate oxygen throughout the year and in some cases, the hypolimnion of shallow stratified lakes may become anoxic
(Cole 1994). Mesotrophic lakes are considered productive but not nutrient enriched. Because of the shallowness of the
lake and constant wind mixing, bottom sediments may contribute to internal nutrient loading. Based on available
information, there is no known significant anthropogenic sources of nutrients to SBR.
PHYSICAL DATA
Habitat condition at two littoral regions of SBR were evaluated with the use of the shore-line habitat characterization
qualitative assessment procedure (WDEQ/WQQ 2001a). Qualitative habitat assessment data can be found on Table 2.
Littoral North - This habitat assessment station represented the “least-impacted” region of the reservoir. Along the north
shore, riparian vegetation cover was adequate with a diversity of sedges and rushes (Photo 1). Although a portion of
the littoral region was exposed due to low water, 40-75% of the littoral region along the north shore was represented by
emergent vegetation such as rushes and sedges with an abundance of submerged aquatic macrophytes. Fish were
observed utilizing the littoral region. Substrate composition along the north shoreline and littoral regions consisted
predominantly of sand, silt and clay. Filamentous algae were considered common along the shoreline though no blooms
were observed in open water. No blue-green algae were present. Conditions at this site were representative of
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littoral/riparian conditions along the upper 1/3 of SBR.
Littoral SE - This habitat assessment station represented the “most-impacted” littoral region of the reservoir and is
representative for approximately 2/3 of SBR shoreline. The riparian region along the southeast shore was >75% bare
ground with the remainder comprised of sedges and rushes (Photo 2). However, this area was an exposed littoral region
that otherwise would be inundated during normal high water conditions. Around 40-75% of the ‘active’ littoral region
on the date of sampling was largely comprised of emergent and submerged aquatic macrophytes. Fish were observed
within the submerged vegetation. Both the littoral zone and shoreline were largely comprised of sand, silt and clay with
some artificially placed cobble and gravel, particularly along the dam. Filamentous algae were considered common
along the shoreline though no blooms were observed in open water. No blue-green algae were present. This southeast
shore along with other areas in the lower portion of the reservoir, including the upstream face of the dam (Photo 3), were
experiencing erosion from wind and wave action. Grazing pressure appeared to inhibit the establishment of riparian
vegetation along a few selected areas of the shoreline above the normal high water mark. Throughout this area, riparian
vegetation appeared stressed due to the last few years of drought conditions and low water levels. Combined, these
factors have produced an unstable shoreline which may contribute additional sediment to the reservoir, particularly under
normal high water conditions.
No indications of excessive reservoir sedimentation from outside sources were noted (e.g. sediment deltas at mouths of
tributaries and loss of open water). Along the upper end of the reservoir, low water levels had exposed a few small
islands and some littoral regions normally inundated under high water conditions.
HISTORICAL AND ANCILLARY INFORMATION
Current Status of the Fishery - SBR is managed by the WGFD as a basic yield rainbow trout (Onchorynchus mykiss)
fishery. WGFD stocks approximately 2000 sub-catchable rainbow trout annually (WGFD, unpublished information).
No other fishes are known to occur in SBR. The WGFD has not observed any algal blooms in SBR (WGFD, personal
communications).
A gill net survey conducted by WGFD in May 2004 captured 54 rainbow trout with a mean length of 15.1 inches and
1.5 pounds. Spot creel data collected in June 2005 showed a mean catch rate of 2.4 fish per hour (WGFD, unpublished
information).
Shirley Basin Reservoir
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QUALITY ASSURANCE/QUALITY CONTROL
Environmental data collected by WDEQ/WQD from SBR was collected in accordance with methods, procedures, and
techniques listed in the Methods section of this report. Station QA/QC reports for each sample station are attached to
this report. Physical, biological, and chemical data collected during 2002 were determined to be complete and accurate.
SUMMARY AND CONCLUSIONS
Classification - The WGFD annually stocks rainbow trout in SBR. Because SBR successfully supports a cold-water
fishery, the current 3B classification appears inaccurate and should be reevaluated.
Water Quality - Water temperatures throughout the deeper portion of the reservoir were slightly above (0.3 above the
criterion) or below the numeric criterion protective of cold water fisheries uses. Water temperatures in the littoral regions
were above the numeric temperature criterion though were associated with the inherent shallowness of these areas
combined with direct insolation. Water temperatures throughout the lake did not exceed 25°C, which is considered the
upper tolerance limit for trout (Walthers and Nener 1998). Considering the available information and the apparent
success of the cold-water fishery in SBR during the recreation season, elevated water temperatures in certain areas of
the reservoir do not appear to compromise the ability of the lake to sustain a cold-water fishery.
SBR did exceed the pH criteria though this was considered natural due to high photosynthetic rates by aquatic
macrophytes and phytoplankton. Based on temperature and dissolved oxygen profiles, SBR appears to weakly stratify
during the summer months and may be dimictic. Dissolved oxygen concentrations in the littoral regions and epilimnion
of the pelagic region were above the minimum criteria protective of aquatic life uses and/or early life stages of aquatic
life. The abnormally high dissolved oxygen concentrations in the littoral regions were due to super-saturation from
aquatic macrophytes.
Because of the high detection limits of the 2002 samples, it is unknown whether total phosphorous and nitrate-nitrogen
concentrations were below the federally recommended nutrient criteria for lakes in the Wyoming Basin ecoregion. The
mean chlorophyll " concentration (a surrogate to evaluate nutrient enrichment) exceeded the federally recommended
minimum chlorophyll " concentration of 1.4 mg/m3 for lakes in the Wyoming Basin ecoregion. However, this is a
recommended criteria are for a large region and are not necessarily lake specific. SBR may receive internal nutrient
loading from the lake sediments, though anthropogenic sources of nutrients to the lake are believed negligible. The mean
TSI for Secchi disk and chlorophyll " indicates SBR is mesotrophic. Mesotrophic lakes are considered productive but
not nutrient enriched. Though light appears to play no limiting role in phytoplankton growth, no algal blooms were
Shirley Basin Reservoir
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observed. The abundance of aquatic macrophytes in the littoral regions appeared to be the result of optimal light
penetration to the lake bottom and water naturally high in minerals. Considering the available information, SBR does
not appear to be subjected to anthropogenic nutrient enrichment.
Habitat Quality - In the “least-impacted” area of SBR, shoreline and littoral habitat consists of submerged and emergent
macrophytes and sand/silt substrates. These areas are found along the upper 1/3 of the reservoir and provide adequate
fish cover. The “most-impacted” area of SBR is found along the southeast shore adjacent to the dam and is
representative of the lower 2/3 of SBR including the upstream face of the dam. Bare ground is prevalent in these areas
with minimal riparian vegetation to stabilize the shoreline. Submerged vegetation was common in the littoral regions
and provided adequate fish cover. The shoreline in the ‘impacted’ area was experiencing erosion from wave and wind
action. Grazing pressure limited establishment of riparian vegetation in some areas. Lastly, riparian vegetation appeared
stressed due to drought and low water levels further exacerbating shoreline erosion.
Sedimentation was listed as a possible source of ‘impairment’ to SBR in the 1996 303(d) list. No deltas or loss of open
water due to accumulated sediment was noted during the 2002 assessment. Based on the available information, the
reservoir does not appear to receive excessive anthropogenic sources of sediment. However, the unstable shorelines
along most of SBR may result in internal sediment contributions to the reservoir. At present, there is no information to
suggest internal sediment loading is compromising the ability of SBR to support designated uses.
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DETERMINATION
! A review of the chemical, physical, and/or biological data collected on Shirley Basin Reservoir in addition to
other sources of information suggests that on the date of sampling and based on its current classification:
1) Fully-supportive of aquatic life other than fish. However, it should be noted that Shirley Basin Reservoir
also supports designated uses associated with cold-water fisheries.
2) Fully supportive of wildlife, industrial, aesthetic value, and agricultural uses.
! Review of biological and chemical data collected on SBR are insufficient to determine fish consumption and
contact recreation use support.
RECOMMENDATIONS
1) Consider a reclassification of Shirley Basin Reservoir.
2) Conduct future E. coli monitoring to determine contact recreation use support.
3) If reclassified to a class 2 water, fish tissue sampling will be needed to determine fish consumption use support.
4) To fully understand nutrient concentrations, stratification and natural variability in lake conditions, additional data
would be needed.
5) Explore best management practices to help minimize shoreline erosion from wind and wave action with the realization
that the erosion potential is largely facilitated by dynamic fluctuations in water level. Manage grazing pressure to
minimize shoreline erosion where appropriate.
SIGNATURES:
___________________________________________________________ ____________________________
Author Date
___________________________________________________________ ____________________________
Peer Reviewer Date
___________________________________________________________ ____________________________
Monitoring Supervisor Date
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LITERATURE CITED
Carlson, R.E. 1979. A trophic state index for lakes. Limnology and Oceanography 22:361-369.
Chapman, S.S., S.A. Bryce, J.M. Omernik, D.G. Despain, J. Zumberge, and M. Conrad. 2003. Ecoregions of Wyoming(color poster with map, descriptive text, summary tables and photographs). Reston, Virginia. U.S. Geological Survey(map scale 1:1,400,000).
Cole, G.A. 1994. Textbook of Limnology 4th Ed. Waveland Press, Inc., Prospect Heights, Illinois. 412 pp.
Omernik, J. M. and A. L. Gallant. 1987. Ecoregions of the west-central United States (map). United StatesEnvironmental Protection Agency, Corvallis, OR.
U.S. Environmental Protection Agency (USEPA). 2001. Ambient Water Quality Criteria Recommendations. InformationSupporting the Development of State and Tribal Nutrient Criteria - Lake and Reservoirs in Nutrient Ecoregion III. Officeof Water. EPA 822-B-01-008.
U.S. Geological Survey (USGS). 1985. Geologic map of Wyoming. Compiled by J.D. Love and A.C. Christansen.Sheets 1,2, and 3. Reston, VA. G85135.
Walthers, L.C. and J.C. Nener. 1998. Water temperature monitoring in the Nicola River, B.C. 1995: Implications ofmeasured temperatures for anadromous salmonids. Canadian Manuscript Report of Fisheries and Aquatic Sciences 2443.
Wetzel, R.G. 1983. Limnology 2nd Edition. Saunders College Publishing, Philadelphia, Pennsylvania. 753 pp.
WDEQ/WQD. 2001. Wyoming Water Quality Rules and Regulations, Chapter 1, Wyoming Surface Water QualityStandards. Water Quality Division, Cheyenne, WY.
WDEQ/WQD. 2001a. Manual of Standard Operating Procedures for Sample Collection and Analysis. WyomingDepartment of Environmental Quality, Water Quality Division, Watershed Program, Cheyenne, WY.
WDEQ/WQD. 2001b. Quality Assurance Project Plan (QAPP) for Beneficial Use Reconnaissance Project (BURP)Water Quality Monitoring. Wyoming Department of Environmental Quality, Water Quality Division, WatershedProgram, Cheyenne, WY.
WDEQ/WQD. 2002. Wyoming’s method for determining water quality condition of surface waters. WyomingDepartment of Environmental Quality, Water Quality Division, Cheyenne, WY.
Shirley Basin Reservoir
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Pelagic Pelagic Littoral North Littoral SE
Date 7/23/2002 7/23/2002 7/23/2002 7/23/2002
Depth (m) 1 3.5 0.5 0.5
Time 1303 1308 1425 1407
Temperature C 20.2 18.6 19.6 21.5
pH 9.28 9.25 9.28 9.29
Conductivity (uS/cm) 5035 4802 4984 5188
Dissolved Oxygen (mg/L) 8.3 6.3 17.9 17.9
Alkalinity (mg/L as CaCO3) 750 740 730 740
Nitrate (mg/L as N) <0.1 <0.1 <0.1 <0.1
Total Phosphorus (mg/L) <0.1 <0.1 <0.1 <0.1
Total Ammonia (mg/L) 0.1 0.2 <0.1 <0.1
Secchi Disk (m) 4 NA 1 1.5
Chlorophyll a (mg/m3) 2.1 NC 3.3 NC
TSI for Secchi Disk 40 NA 60 54.2
TSI for Chlorophyll a 37.9 NC 42.3 NC
*TSI for Total Phosphorous 70.6 70.6 70.6 70.6
Sheen None None None None
Color Pale Green Pale Green Pale Green Pale Green
Odor None None None None
*Total phosphorous value w as set at the detection limit of 0.1 mg/L
NA = Not applicable ; NC = Not collected
Table 1 - Physicochemical results and Trophic State Index scores for Shirley Basin Reservoir. July 2002. CarbonCounty.
Shirley Basin Reservoir
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Littoral North 7/23/2002
Littoral SE 7/23/2002
aRiparian VegetationTrees 0 0
Shrubs 1 1Herbs, Forbs, Grasses, Grass-like Plants 2 1
Standing w ater vegetation 0 0Bare ground / human development 2 4
bLittoral VegetationFloating macrophytes 0 0
Rooted macrophytes (emergent) 2 3Rooted macrophytes (submergent) 3 3
Total littoral vegetation 3 3
cShoreline Substrate CompositionBedrock (>4096 mm) 0 0
Boulder (256-4096 mm) 0 0Cobble (65-255 mm) 1 2
Gravel (2-64 mm) 3 2Sand (0.062-1.9 mm) 3 2Silt/Clay (<0.062 mm) 2 3
bLittoral Substrate CompositionBedrock (>4096 mm) 0 0
Boulder (256-4096 mm) 0 1Cobble (65-255 mm) 1 1
Gravel (2-64 mm) 1 3Sand (0.062-1.9 mm) 1 3Silt/Clay (<0.062 mm) 4 2
Submerged w oody debris 0 0
c Shoreline zone is 1 m from the waterline back onto the land
0 = Absent
1 = Sparse (<10% aerial coverage)
2 = M oderate (10-40% aerial coverage)
3 = High (40-75% aerial coverage)
4 = Dominant (>75% aerial coverage)
a Riparian zone is 15 m along shoreline and 15 m back onto the land
b Litto ral zone is 15 m along shoreline and 10 m from the shoreline to the water or out to a safe wading distance
Table 2 - Qualitative lake habitat assessment for Shirley Basin Reservoir. July 2002. Carbon County.
Shirley Basin Reservoir
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Littoral North 7/23/2002
Littoral SE 7/23/2002
Fish Cover (w ithin the littoral zone)Aquatic vegetation 2 2
Floating or submerged snags (>0.3 m diam.) 0 0Brush or w oody debris (<0.3 m diam.) 0 0
Inundated standing trees (>0.3 m diam.) 0 0Overhanging vegetation (<1 m abv. Surface) 0 0
Rock ledges or sharp drop-offs 0 1Boulders 0 1
Man-made structures (docks, pilings, rip-rap) 0 0
Littoral North 7/23/2002
Littoral SE 7/23/2002
Biological ParametersFilamentous Algae Common Common
Periphyton (shoreline only) Rare AbundantFish Common Common
High Water Line (from present lake level)Vertical distance (ft) 3-3.5 3-3.5
Hortizontal distance (ft) 65 35
Shoreline bank angle 0-30 degrees 0-30 degrees
0 = Absent
1 = Present but sparse
2 = Present in moderate to heavy density
Table 2 (cont.) - Qualitative lake habitat assessment for Shirley Basin Reservoir. July 2002. Carbon County.
Shirley Basin Reservoir
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0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
15.0 20.0 25.0 30.0
Temperature (C)D
epth
(m)
Pelagic Littoral North Littoral SE
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0.0 20.0 40.0 60.0 80.0 100.0
Oxidation Reduction Potential (mV)
Dep
th (m
)
Pelagic Littoral North Littoral SE
Figure 1 - Vertical profiles for temperature and redox potential on Shirley Basin Reservoir. July 2002. CarbonCounty.
Shirley Basin Reservoir
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0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
4800.0 5000.0 5200.0 5400.0
Conductivity (uS/cm)
Dep
th (m
)
Pelagic Littoral North Littoral SE
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0.0 5.0 10.0 15.0 20.0
Dissolved Oxygen (mg/L)
Dep
th (m
)
Pelagic Littoral North Littoral SE
Figure 1 (cont.) - Vertical profiles for conductivity and dissolved oxygen on Shirley Basin Reservoir. July 2002.Carbon County.
Shirley Basin Reservoir
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Map 1 -Shirley Basin Reservoir and surrounding area.
Shirley Basin Reservoir
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Map 2 -Shirley Basin Reservoir and WDEQ/WQD monitoring stations. July 2002. Carbon County.
Shirley Basin Reservoir
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Photo 1 - Littoral/riparian zone at the Shirley Basin Reservoir Littoral North site. July 2002. Carbon County.
Shirley Basin Reservoir
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Photo 2 - Littoral/riparian zone at the Shirley Basin Reservoir Littoral SE site. July 2002. Carbon County.
Shirley Basin Reservoir
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Photo 3 - Upstream face of Shirley Basin Reservoir dam. Note erosion from wind and wave action. July 2002. Carbon County.
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