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MISSOURI RIVER MAIN STEM
06338000 LAKE SAKAKAWEA NEAR RIVERDALE, ND
LOCATION.--Lat 47°30'10", long 101°25'50", in S1/2 sec.31, T.147 N., R.84 W., Mercer County, Hydrologic Unit 10110101, in
control structure of Garrison Dam, 2.5 mi west of Riverdale, 14 mi upstream from Knife River, and at mile 1,389.9.
DRAINAGE AREA.--181,400 mi2, approximately.
MONTHEND-ELEVATION AND CONTENTS RECORDS
PERIOD OF RECORD.--October 1953 to current year. Prior to October 1966, published as Garrison Reservoir near Riverdale.
REVISED RECORDS.--WSP 1559: 1957(M).
GAGE.--Water-stage recorder. Datum of gage is at sea level.
REMARKS.--Reservoir is formed by earth-fill dam; storage began in November 1953. Maximum capacity, 24,200,000 acre-ft
below elevation 1,854.0 ft, top of 29-ft gates. Normal maximum, 22,700,000 acre-ft below elevation 1,850.0 ft, of which
about 4,300,000 acre-ft is designated for flood control. Elevation of crest of spillway, 1,825.0 ft, surmounted by
radial gates. Inactive storage, 5,000,000 acre-ft below elevation 1,775.0 ft. Dead storage, zero at elevation 1,672.0
ft. Snake Creek arm of the reservoir has connecting gate to main reservoir, with sill at elevation 1,810 ft. Figures
herein represent total contents.
COOPERATION.--Records furnished by the U.S. Army Corps of Engineers. Elevations are observed elevations at midnight on
the last day of each month. Contents are computed based on reservoir inflow, reservoir outflow, evaporation, and
rainfall; and are adjusted for wind effect.
EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 24,368,000 acre-ft, July 25, 1975, elevation, 1,854.6 ft; minimum since
first reaching normal maximum level in July of 1969, 12,155,000 acre-ft, May 10, 1991, adjusted for wind effect; minimum
elevation, 1,815.0 ft, May 14, 1991.
EXTREMES FOR CURRENT YEAR.--Maximum contents, 20,221,000 acre-ft, Oct. 1, adjusted for wind effect, elevation, 1,844.0 ft;
minimum contents, 16,816,000 acre-ft, Sept. 30, elevation, 1,833.1 ft.
MONTHEND ELEVATION AND CONTENTS, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
___________________________________________________________________________________________________________________
Date Elevation Contents Change in contents
(feet) (acre-feet) (acre-feet)
___________________________________________________________________________________________________________________
Sept. 30 --------------------------- 1,844.1 20,256,000 --
Oct. 31 ---------------------------- 1,844.0 19,846,000 -410,000
Nov. 30 ---------------------------- 1,842.0 19,539,000 -307,000
Dec. 31 ---------------------------- 1,840.6 19,078,000 -461,000
CAL YR 1999 -- -- +48,000
Jan. 31 ---------------------------- 1,839.3 18,667,000 -411,000
Feb. 29 ---------------------------- 1,837.7 18,158,000 -509,000
Mar. 31 ---------------------------- 1,837.3 18,019,000 -139,000
Apr. 30 ---------------------------- 1,836.0 17,623,000 -396,000
May 31 ----------------------------- 1,835.6 17,542,000 -81,000
June 30 ---------------------------- 1,838.0 18,253,000 +711,000
July 31 ---------------------------- 1,837.4 18,087,000 -166,000
Aug. 31 ---------------------------- 1,834.6 17,321,000 -766,000
Sept. 30 --------------------------- 1,833.1 16,816,000 -505,000
WTR YR 2000 -- -- -3,440,000
___________________________________________________________________________________________________________________
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