city of fargo, southeast cass water resource district, southside flood protection environmental...
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City of Fargo,Southeast Cass Water Resource
District,
Southside FloodProtection
Environmental Assessment AgencyScoping Meeting
December 9, 2008
1997 Spring Flood –Fargo, Moorhead
Rose Coulee
Red River
Fargo
50th Avenue South
Moorhead
Univ
ers
ity D
rive
1997 Spring Flood – South of Fargo
Rose Coulee
25
th S
treet
South
Cas
s C
o D
rain
53
Fargo
University Drive
1997 Spring Flood – South of Fargo
Cass
Co
Hw
y 81
25th Street S
outhInterstate 29 Rose Coulee
Wild Rice River
Red River
Fargo Moorhead
1997 Spring Flood – South of Fargo
Inte
rstate
29
Wild Rice River
25 th Street SouthSt. Benedict
Cass Co Hwy 16
1997 Spring Flood – South of Fargo
Interstate 29St. Benedict
Cass Co Hwy 16
Wild Rice RiverCass Co Drain 47
• Provide Protection from overland flooding that threatens the majority of properties south of I-94.
• Prevent extensive expansion of South Fargo Floodplain and mandatory flood insurance requirement.
• Provide growth area, helping to keep our region’s economy healthy.
Southside Flood Control
1997 Spring Flood
Areas InundatedWith Floodwater
andEstimate of Areas
Protected byEmergency Measures
Interstate Hwy 94
Cass Co Hwy 6
Cass Co Hwy 16
Cass Co Hwy 14
Cass Co Hwy 18
Inte
rsta
te H
wy 2
9
Fargo
Oxbow
Horace
Moorhead
West Fargo
Shey
enne
Riv
er
Wild
Ric
e Riv
erRed
Riv
er
Red R
iver
Southside Flood
Control
Preliminary 100 & 500 Year
Floodplains – Red and Wild Rice Rivers
Oxbow
Horace
MoorheadWest Fargo
FargoInterstate Hwy 94
Inte
rsta
te H
wy 2
9
Southside Flood
Control
RED RIVER AT FARGO - USGS GAGING STATIONHISTORICAL FLOOD DATA
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000
Years of Record
50 Year Discharge - 22,300 CFS
10 Year Discharge - 10,300 CFS
100 Year Discharge - 29,300 CFS
Pea
k D
isch
arge
(CFS)
1997 Spring Flood - 28,000 CFS
Southside Flood Control
North Dakota State Climate Office
• FEMA levees & floodwalls
• Channel extensions(Red River & drain improvements)
• Floodwater storage inside of project
• Pump stations
• Control structures
Project Flood Control Methods
Base Project
Southside Flood
Control
Wild Rice River Levee
Alternative
Issues Raised With Base Alternatives• Red River & Wild Rice River impacts
(Higher flood levels)
• Lost storage (Concern storage impact will simply move impacts upstream)
• Properties east of Hwy 81 and upstream receive no protection
Wild Rice River Levee Alternative
withChannel Extensions
& Supplemental Storage
Southside Flood
Control
Wild Rice River Levees Alternative – Red River Impacts
Wild Rice River Levee Alternative
Selected Plan
River Stage Changes100 Year Flood
Southside Flood
Control
Preliminary 100 Year Floodplain
Southside Flood
Control
Horace
Inte
rsta
te H
wy 2
9
Interstate Hwy 94
Preliminary 100 Year Floodplain with Line
of Protection
Southside Flood
Control
Horace
Interstate Hwy 94
Inte
rsta
te H
wy 2
9
Southside Flood
Control
After Project
Preliminary 100 Year Floodplain
Interstate Hwy 94
Inte
rsta
te H
wy 2
9
Horace
1997 Spring Flood – Burritt Kennedy, Lemke and Harwood Groves Area
Red River
Fargo Moorhead
Modifications to Base Project
32nd to 40th Avenue South Pursue primary protection through backyards
South AcresInclude in primary protection alignment
Channel Extension Alignment Chrisan West
Include in primary protection alignment
Maple PrairieInclude in primary protection alignment
Modifications to Base Project
Mini Bypass (Wild Rice River)Pursue mini bypass alignment
to protect additional properties
Storage Plan & Drain ImprovementsPursue storage along Drain 27
Chrisan EastPursue secondary protection
Option 1 - River Side Permanent FWOption 1 - River Side Permanent FW32nd to 40th Avenue – Backyard 32nd to 40th Avenue – Backyard OptionsOptions
Wild Rice River Area Options
Option 1: No Wild Rice River Crossing
Option 2 (Base): Wild Rice River Crossing
Option 3: Mini-Bypass
Option 1 – No Wild Rice River Crossing
Option 2 – Wild Rice River Crossing
Option 3 – Mini-Bypass
STORAGE SUMMARYExisting effective storage 6,000 Acre-Ft
Base project 0 Acre-Ft
Channel extension/storage 2,000 Acre-Ft
Supplemental storage 4,000 Acre-Ft
Southside Flood
Control
Southside Flood Control
Red River Channel
Extension Options
North Dakota
Minnesota
Red River
Red RiverChannel
Extension
Typical Red River Cross-Section
Wild Rice River Levee Alternative
withPreferred
Alignments
Southside Flood
Control
1997 Spring Flood – South of Fargo
Rose CouleeRed River
25th S
treet
Sou
th
Fargo
University DriveMoorhead
Project Schedule – Next Steps
• Environmental Assessment
• Conditional Letter of Map Revision (CLOMR)
• Permitting
• Special Assessment Process
• Development of Final Design
Questions / Discussion
Southside Flood Control