Missouri River Flooding Jun 2011

8/6/2019 Missouri River Flooding Jun 2011

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US Army Corps of Engineers

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Corps of EngineersUS Army

Missouri River Mainstem Reservoir System

2011 Flood Regulation


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Fort Peck

Oahe

Garrison

Big Bend

Fort Randall

Gavins Point

Montana

Kansas

Iowa

Nebraska

North

Dakota

South

Dakota

Wyoming

Missouri

Colorado

Bank Stabilization and Navigation Project

Sioux City, IA

St. Louis, MO

Congressionally AuthorizedProject Purposes

Flood Control

Navigation

Hydropower

IrrigationRecreation

Water Supply

Water Quality

Fish and Wildlife(Including endangered species)

Missouri River MainstemReservoir System

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Historic max - 1975

Missouri River Mainstem System

Storage Zones and Allocations5 June 2011

Exclusive Flood Control 6%

CarryoverMultiple Use 53%

PermanentPool 25%

0

17.9

56.8

73.1

68.4

72.1

Storage

In MAF

33.9

Annual Flood Control &Multiple Use 16%

Current = 71.0 MAF

Historic min - 2007

2011 Minimum2011 Current

System storage change since

2011 runoff season began = +14.2 MAF

4

2011 Minimum = 56.8 MAF

28 January 2011


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Fort Randall

FortPeck

Big

Bend

Garrison

Oahe

Gavins

Point

Project Total Flood

Control Storage

(ac-ft)

% of Total

Flood

Storage

Fort Peck 3,675,000 22.6

Garrison 5,711,000 35.1

Oahe 4,303,000 26.5

Big Bend 177,000 1.1

Fort Randall 2,294,000 14.1

Gavins Point 108,000 0.7

The shapes are to scale and represent

the relative size of the total flood

control storage (annual + exclusive)at the six mainstem projects.

(Exclusive) (Exclusive)

(Exclusive)

(Exclusive)

(Annual)

(Annual)

(Annual)

(Annual)

Flood Control Storage

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Mainstem Reservoir Levels5 June 2011

2220.1

Exclusive Flood Control = 1.0 MAF

Annual Flood Control &Multiple Use = 2.7 MAF

Carryover

Multiple Use

Permanent

Pool

2250

2220.1


Annual Flood Control &Multiple Use = 4.2 MAF

Carryover

Multiple Use

Permanent

Pool

2220.1


Annual Flood Control &

Multiple Use = 3.2 MAF

Carryover

Multiple Use

Permanent

Pool

2246

2234

2160

2030

1854

1850

1837.5

1775

1673

1620

1617

1607.5

1540

1415

Fort Peck

Oahe

Garrison

2235.1

1853.6

1617.2 2220.1


Annual Flood Control &

Multiple Use = 1.3 MAF

Carryover

Multiple Use

Permanent

Pool

1375

1365

1350

1320

1240

Fort Randall

1360.4

1837.7

1619.2

1340.3

2250.3

2011 Minimum

2011 Current

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May, June and JulyMarch and April March through October

Runoff Components

2011 Forecast* = 54.6 MAF

Highest runoff since 1898

Previous Record was 49.0 MAF in 1997

Mountain SnowpackPlains Snowpack Rainfall

*June 1 Forecast 7


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Plains Snowpack25 February 2011

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May 2011 Precipitation

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Missouri River Runoff above Sioux City

2011 Actual/Forecasted versus Normal

0

2

4

6

8

10

12

14

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Normal 2011 Actual/Forecasted

231%

267%

321 %

11

228 %

224 %

Million Acre-Feet


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Missouri River BasinMay 2011 Runoff

Fort Peck: 2.9 maf (266%)

: 4.4 maf (355%)

: 1.3 maf (403%)

: 0.3 maf (207%)

: 0.1 maf (100%)

: 1.6 maf (549%)

Garrison

Oahe

Fort Randall

Gavins Point

St. Louis

Nebraska City

Sioux City

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Missouri River Mainstem Reservoir

May 2011 Runoff

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2011 Previous Record

Fort Peck 2.9 MAF 2.6 MAF(1975)

Garrison 4.4 MAF 2.8 MAF(1978)

Fort Peck and Garrison 7.3 MAF 6.7 MAF(1952)

Total Above Sioux City 10.5 MAF 7.2 MAF(1995)


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Missouri River Mainstem Reservoir

System Master Manual

First published in 1960

Updated in 1975 and 1979

Master Manual Review and Update began in

November 1989 in response to late 1980s / early

1990s drought

Amended Biological Opinion received from USFWS

in December 2003

Manual was revised for drought conservation in

March 2004

Again revised in March 2006 for Gavins Point spring

pulse

Annual Operating Plan (AOP) developed annually in

accordance with Master Manual

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2011 Mainstem System Regulation

Mainstem Reservoir System has been operated in

accordance with the Master Manual

Release schedules have been coordinated with LRD

and MVD, but we do not have authority to regulatethe mainstem reservoir system solely for the benefit

of the Mississippi River

No operational decisions have been driven by ESA

(nesting least terns and piping plovers); reservoirs

have been operating for flood risk reduction.

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2011 Mainstem System Regulation

Full flood control capacity of the mainstem reservoir

system was available at the start of the 2011 runoff

season

2010 was 3rd highest runoff year on recordAll flood water was evacuated prior to start of runoff

High releases will continue through at least mid-

August to evacuate stored flood water

Goal is to evacuate reservoirs to provide time for damage

assessment and repair prior to next years runoff season

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Background slides

Photos of 6 mainstem dams

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Fort Peck


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Oahe


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Big Bend


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Fort Randall


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Gavins Point

Missouri River Flooding Jun 2011

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