city of fargo, southeast cass water resource district, southside flood protection environmental...

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