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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
2
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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
Exclusive Flood Control = 1.5 MAF
Annual Flood Control &Multiple Use = 4.2 MAF
Carryover
Multiple Use
Permanent
Pool
2220.1
Exclusive Flood Control = 1.1 MAF
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
Exclusive Flood Control = 1.0 MAF
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
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