06338000 LAKE SAKAKAWEA NEAR RIVERDALE, ND
LOCATION.--Lat 47
×30'10", long 101
×25'50", in S
1/
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 mi
2, 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 National Geodetic Vertical Datum of 1929.
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, 11,644,000 acre-ft, Sept. 29, 2004, adjusted for wind effect; minimum elevation, 1,813.2 ft, Sept. 28, 2004.
EXTREMES FOR CURRENT YEAR.--Maximum contents, 13,497,000 acre-ft, Oct. 1, adjusted for wind effect, elevation, 1,820.8 ft; maximum elevation, 1,820.9 ft, Oct. 2;
minimum contents, 11,644,000 acre-ft, Sept. 29, elevation, 1,813.3; minimum elevation, 1,813.2 ft, Sept. 28.
MONTHEND ELEVATION AND CONTENTS, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
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Date
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Elevation
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Contents
(acre-feet)
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Change in contents
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