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MISSOURI-OAHE RIVER BASIN
06439980 LAKE OAHE NEAR PIERRE, SD
LOCATION.--Lat 44o27'30", long 100o23'29", in NE1/4 sec.1, T.111 N., R.80 W., 5th principal meridian, Hughes County, Hydrologic
Unit 10130105, in Pier A of Control Tower No. 1 of powerhouse intake structure of dam on Missouri River, 6.0 mi northwest of
Pierre, 7.1 mi upstream from Bad River, and at mile 1,072.3.
DRAINAGE AREA.--243,500 mi2, approximately.
MONTHEND-ELEVATION AND CONTENTS RECORDS
PERIOD OF RECORD.--August 1958 to current year (monthend contents only). Prior to October 1967, published as Oahe Reservoir near
Pierre.
GAGE.--Water-stage recorder. Datum of gage is above sea level. Prior to Jan. 14, 1958, nonrecording gages at various locations
upstream from outlet works, Jan. 14, 1959, to Sept. 30, 1962, recorder in Tower No. 1 of outlet works, all at same datum.
REVISED RECORDS.--WDR SD-88-1: September monthend elevation.
REMARKS.--Reservoir is formed by an earthfill dam; storage began in August 1958. Maximum capacity, 23,338,000 acre-ft below
elevation 1,620.0 ft (top of spillway gates). Normal maximum, 22,240,000 acre-ft below 1,617.0 ft, of which about
2,390,000 acre-ft is designated for flood control. Inactive storage, 5,451,000 acre-ft below elevation 1,540.0 ft. Dead
storage, 1,970 acre-ft below elevation 1,425.0 ft (invert of lowest outlet tunnel). Figures given herein represent elevations
at powerhouse intake structure and total contents adjusted for wind effect.
The spillway consists of a gated chute with flat crest at elevation 1,596.5 ft, 8 gates, 50 by 23.5 ft each; design capacity,
300,000 ft3/s. The outlet works consist of 7 turbines with a generating capacity of 85,000 kilowatts each. Water is used for
flood control, navigation, power, and incidental uses.
COOPERATION.--Records of elevation and contents provided by U.S. Army Corps of Engineers.
EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 22,764,000 acre-ft, May 14, 1986, affected by wind; maximum elevation,
1,618.71 ft, June 25, 1995; minimum since initial filling, 12,071,000 acre-ft, Oct. 30, 1989, Nov. 1, 1989.
EXTREMES FOR CURRENT YEAR.--Maximum contents, 22,149,000 acre-ft, July 11; minimum contents, 18,411,000 acre-ft, Jan. 23.
MONTHEND ELEVATION AND CONTENTS AT 2400, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
_____________________________________________________________________________________________
Date Elevation Contents Change in Contents
(feet) (acre-feet) (acre-feet)
_____________________________________________________________________________________________
Sept. 30 ---------- 1,610.57 19,732,000 --
Oct. 31 ----------- 1,609.53 19,532,000 -200,000
Nov. 30 ----------- 1,609.29 19,402,000 -130,000
Dec. 31 ----------- 1,607.43 18,782,000 -620,000
CAL YR 1998 --- --- -766,000
Jan. 31 ---------- 1,606.36 18,484,000 -298,000
Feb. 28 ---------- 1,607.92 18,964,000 +480,000
Mar. 31 ---------- 1,609.20 19,275,000 +311,000
Apr. 30 ---------- 1,611.08 20,000,000 +725,000
May 31 ---------- 1,615.58 21,538,000 +1,538,000
June 30 ---------- 1,616.97 22,035,000 +497,000
July 31 ---------- 1,616.94 22,042,000 +7,000
Aug. 31 ---------- 1,616.96 21,863,000 -179,000
Sept. 30 --------- 1,614.67 21,114,000 -749,000
WTR YR 1999 --- --- +1,382,000
_____________________________________________________________________________________________
Note.--Lake frozen over Jan. 25 to Mar. 30.
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