Missouri River Mainstem Reservoir System US Army Corps

Missouri River Mainstem Reservoir System US Army Corps of Engineers 20 October 2011 US Army Corps of Engineers BUILDING STRONG®

Missouri River Mainstem Reservoir System Fort Peck North Dakota Garrison Montana South Dakota Oahe Wyoming Big Bend Fort Randall Gavins Point Congressionally Authorized Project Purposes Flood Control Navigation Hydropower Irrigation Recreation Water Supply Iowa Water Quality Fish and Wildlife (Including endangered species) Nebraska Colorado Kansas Missouri Bank Stabilization and Navigation Project Sioux City, IA – St. Louis, MO

Terminology § Acre-Feet = volume of water to cover 1 acre, 1 ft deep § MAF = Million Acre-Feet § cfs = cubic feet per second (flow) § 1 cfs fills almost one and one-half 5 gallon buckets per second § 160, 000 cfs = 3’-3” of water over a football field every second § River Stage § Measurement of water surface at river gage location 3

2011 Missouri River Flood § Major flooding in seven states § Largest releases from Mainstem Reservoirs § § Maximum release in 2011 = 160, 000 cfs Previous maximum release = 70, 000 cfs (1997) § Most inflow to the mainstem reservoir system since completed in 1964 Bismarck, ND St. Joseph, MO 4

Mainstem Reservoir Runoff Components Plains Snowpack March and April Mountain Snowpack May, June and July Rainfall March through October 2011 Forecast* = 60. 4 MAF Highest runoff since 1898 Previous Record was 49. 0 MAF in 1997 Average = 24. 8 MAF *October 1 Forecast 5

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May 2011 Precipitation 7 BUILDING STRONG®

Missouri River Mainstem System Annual Runoff above Sioux City, IA 70 Million Acre-Feet Historic Drought Periods 60 2011 Forecast 50 40 30 20 34. 3 MAF 10% 30. 3 25% 24. 4 50% 19. 3 16. 2 75% 90% U. D. U. Q. Med. L. Q. L. D. 10 0 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 8

2011 Mainstem System Regulation (What Actually Happened) § Unprecedented runoff occurred in the Missouri River Basin above Sioux City, Iowa during May, June and July ► ► June was the single wettest month on record with 13. 8 MAF of runoff, surpassing the old record of 13. 2 MAF set in April 1952. May was the third wettest single month on record, with 10. 5 MAF of runoff shattering the previous May record of 7. 2 MAF set in May 1995 July was the fifth wettest single month on record with 10. 0 MAF Combined May through July runoff of 34. 3 MAF is higher than the total annual runoff in 102 of 113 years in the period of record 9 BUILDING STRONG®

Did I miss something? § Historic Flooding: § § § Sioux City – largest flood since 1964 Omaha – 2 nd largest flood since 1964 St. Joseph – 2 nd largest flood since 1964 Kansas City – 6 th largest flood since 1964 Boonville – 22 nd largest flood since 1964 § At Boonville: § § § 2011 maximum flow = 260, 000 cfs 2011 maximum stage = 27. 9 ft 1993 maximum flow = 755, 000 cfs 1993 maximum stage = 37. 1 ft - (ASK YOUR PARENTS!) Flood Stage = 21 ft Larger floods in 2007, 2008, 2009, and 2010 10 BUILDING STRONG®

Missouri River Mainstem Reservoir System Fort Peck North Dakota Garrison Montana South Dakota Oahe Wyoming Big Bend Fort Randall Gavins Point Congressionally Authorized Project Purposes Flood Control Navigation Hydropower Irrigation Recreation Water Supply Iowa Water Quality Fish and Wildlife (Including endangered species) Nebraska Colorado Kansas Missouri Bank Stabilization and Navigation Project Sioux City, IA – St. Louis, MO BUILDING STRONG®

Garrison Dam 12 BUILDING STRONG®

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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 1980’s / early 1990’s drought § Manual was revised for drought conservation in March 2004 § Again revised in March 2006 for spring pulse BUILDING STRONG®

Authorized Purposes Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Flood Control Irrigation Hydropower Recreation Water Supply Navigation Water Quality Fish & Wildlife March Pulse May Pulse BUILDING STRONG®

Stakeholder Groups in Your Project § § § § Agriculture Flood Control Fish & Wildlife Recreation Power Water Quality/Supply Navigation BUILDING STRONG®

Missouri River Mainstem Reservoir System 75, 0 Top of Exclusive Flood Control Zone 70, 0 Top of Annual Flood Control and Multiple Use Zone 60, 0 Base of Annual Flood Control and Multiple Use Zone 55, 0 50, 0 45, 0 40, 0 Historical Minimum Storage 35, 0 2011 2009 2007 2005 2003 2001 1999 1997 1995 1993 1991 1989 1987 1985 1983 1981 1979 1977 1975 1973 1971 1969 30, 0 1967 Millions 65, 0

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Challenges & Opportunities § § § Geographic extent of basin Diverse interests Long-standing differences Droughts/floods Lack of trust Litigation § Watershed approach § Power of consensus § Stakeholders want a voice in recovery decisions § Congressional Legislation BUILDING STRONG®

Missouri River Mainstem System Annual Runoff above Sioux City, IA 70 Million Acre-Feet Historic Drought Periods 60 2011 Forecast 50 40 30 20 34. 3 MAF 10% 30. 3 25% 24. 4 50% 19. 3 16. 2 75% 90% U. D. U. Q. Med. L. Q. L. D. 10 0 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 21 BUILDING STRONG®

Questions? 22 BUILDING STRONG®