GUNNISON RIVER BASIN

09147022 RIDGWAY RESERVOIR NEAR RIDGWAY, CO

LOCATION.--Lat 38°14'14", long 107°45'27", NW14SW14 sec.16, T.46 N., R.8 W., Ouray County, Hydrologic Unit 14020006, in concrete gate house at base of Ridgway Reservoir on Uncompahgre River, 0.5 mi upstream from Fisher Creek, and 5.3 mi north of Ridgway.

DRAINAGE AREA.--265 mi2.

PERIOD OF RECORD.--October 1988 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09147022

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 6,871.3 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. Dam completed Mar. 22, 1988. Capacity 84,590 acre-ft, between 6,680.0 ft, streambed at dam axis and 6,871.3 ft, crest of spillway. Dead storage below elevation 6,720.0 ft, 1,430 acre-ft. Figures given are live contents.

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

EXTREMES FOR PERIOD OF RECORD.--Maximum contents 84,900 acre-ft, June 11, 1990, elevation 6,872.93 ft; minimum contents, 49,810 acre-ft, June 2, 1995, elevation, 6,834.93 ft.

EXTREMES FOR CURRENT YEAR.--Maximum daily mean contents, 83,420 acre-ft, May 31, mean elevation, 6,871.54 ft; minimum daily mean contents, 53,720 acre-ft, Oct. 21; mean elevation, 6,839.84 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. . . . . . . . . . . . . . . . . . . . . . . . .	6,840.39	54,170	-
Oct. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	6,841.26	54,880	+710
Nov. 30 . . . . . . . . . . . . . . . . . . . . . . . . .	6,844.68	57,740	+2,860
Dec. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	6,846.86	59,620	+1,880
CAL YR 2002. . . . . . . . . . . . . . . . . . . .	-	-	-6,760
Jan. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	6,848.64	61,180	+1,560
Feb. 28 . . . . . . . . . . . . . . . . . . . . . . . . .	6,850.16	62,530	+1,350
Mar. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	6,853.38	65,460	+2,930
Apr. 30 . . . . . . . . . . . . . . . . . . . . . . . . .	6,860.14	71,850	+6,390
May 31. . . . . . . . . . . . . . . . . . . . . . . . . .	6,871.49	83,360	+11,510
June 30 . . . . . . . . . . . . . . . . . . . . . . . . .	6,869.39	81,140	-2,220
July 31 . . . . . . . . . . . . . . . . . . . . . . . . .	6,862.33	73,990	-7,150
Aug. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	6,857.03	68,870	-5,120
Sept. 30. . . . . . . . . . . . . . . . . . . . . . . . .	6,860.46	72,160	+3,290
WTR YR 2003. . . . . . . . . . . . . . . . . . .	-	-	+17,990