GUNNISON RIVER BASIN

09125800 SILVER JACK RESERVOIR NEAR CIMARRON, CO

LOCATION.--Lat 38°13'58", long 107°32'28", in T.46 N., R. 6 W., Gunnison County, Hydrologic Unit 14020002, in gate house of Silver Jack Dam on Cimarron River, 14.5 mi south of Cimarron.

DRAINAGE AREA.--59 mi2.

PERIOD OF RECORD.--October 1987 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09125800

REVISED RECORDS.--WDR CO-92-2: 1991 minimum contents.

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 8925.60 ft. above NGVD of 1929, (levels by U.S. Bureau of Reclamation); gage readings have been reduced to elevations above NGVD of 1929.

REMARKS.--Reservoir is formed by an earthfill dam. Storage began in December 1970; dam completed December 1971. Capacity, 13,520 acre-ft, 1971 survey, between elevation 8,800.0 ft, streambed at dam, and 8,925.6 ft, crest of spillway. Dead storage below elevation 8,836.0 ft, 520 acre-ft. Figures given are live contents.

COOPERATION.--Capacity tables provided by U.S. Bureau of Reclamation.

EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 13,550 acre-ft, June 15-16, 1995, elevation, 8,927.45 ft; minimum daily mean contents, 934 acre-ft, Oct. 2, 2002, mean elevation, 8,853.77 ft.

EXTREMES FOR CURRENT YEAR.--Maximum daily mean contents, 13,370 acre-ft, May 30, mean elevation, 8,926.84 ft; minimum daily mean contents, 934 acre-ft, Oct. 2, mean elevation, 8,853.77 ft.

MONTHEND ELEVATION AND CONTENTS, AT 2400, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Elevation (feet)	Contents (acre-feet)	Change in contents (acre-feet)
Sept. 30. . . . . . . . . . . . . . . . . . . . . . . . .	8,853.93	940	-
Oct. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	8,856.79	1,150	+210
Nov. 30 . . . . . . . . . . . . . . . . . . . . . . . . .	8,862.51	1,630	+480
Dec. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	8,865.81	1,930	+300
CAL YR 2002. . . . . . . . . . . . . . . . . . . .	-	-	-730
Jan. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	8,868.38	2,180	+250
Feb. 28 . . . . . . . . . . . . . . . . . . . . . . . . .	8,869.47	2,300	+120
Mar. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	8,871.77	2,540	+240
Apr. 30 . . . . . . . . . . . . . . . . . . . . . . . . .	8,888.43	4,790	+2,250
May 31. . . . . . . . . . . . . . . . . . . . . . . . . .	8,926.76	13,350	+8,560
June 30 . . . . . . . . . . . . . . . . . . . . . . . . .	8,925.72	13,040	-310
July 31 . . . . . . . . . . . . . . . . . . . . . . . . .	8,912.07	9,430	-3,610
Aug. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	8,891.53	5,290	-4,140
Sept. 30. . . . . . . . . . . . . . . . . . . . . . . . .	8,890.71	5,150	-140
WTR YR 2003. . . . . . . . . . . . . . . . . . .	-	-	+4,210