SAN JUAN RIVER BASIN

09353000 VALLECITO RESERVOIR NEAR BAYFIELD, CO

LOCATION.--Lat 37°23'00", long 107°34'30", in SW14SW14 sec.18, T.36 N., R.6 W., La Plata County, Hydrologic Unit 14080101, in gatehouse above outlet gates at Vallecito Dam on Los Pinos (Pine) River, 300 ft left of spillway, 0.4 mi upstream from Jack Creek, and 11 mi northeast of Bayfield.

DRAINAGE AREA.--255 mi2.

PERIOD OF RECORD.--April 1941 to current year, monthly acre feet only 1941-1960, published in WSP 1313 and 1733. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09353000

REVISED RECORDS.--WSP 959: 1941. WSP 1513: 1956. WDR CO-00-2: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 7,580 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 earth and rockfill dam; dam completed in March 1941. Capacity of reservoir, 125,640 acre-ft between elevations
7,580 ft, sill of outlet gate, and 7,665 ft, top of spillway gates. Dead storage, 4,314 acre-ft. Figures given are usable contents. Reservoir is used to store
water for irrigation in Los Pinos (Pine) River basin and provide hydroelectric power.

COOPERATION.--Records provided by Pine River Irrigation District.

EXTREMES (AT 0900) FOR PERIOD OF RECORD.--Maximum contents, 128,200 acre-ft, July 27, 1957, elevation, 7,665.72 ft; minimum, 1,520 acre-ft, Oct. 24-25, 1944, elevation, 7,584.10 ft. No usable storage prior to April 1941.

EXTREMES (AT 0900) FOR CURRENT YEAR.--Maximum contents, 82,100 acre-ft, June 6, elevation, 7,647.95 ft; minimum contents, 19,430 acre-ft, October 1, elevation, 7,611.92 ft.

MONTHEND ELEVATION AND CONTENTS, AT 0900, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Elevation (feet)	Contents (acre-feet)	Change in contents (acre-feet)
Sept. 30. . . . . . . . . . . . . . . . . . . . . . . . .	7,611.78	19,280	-
Oct. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	7,615.88	23,910	+4,630
Nov. 30 . . . . . . . . . . . . . . . . . . . . . . . . .	7,619.82	28,880	+4,970
Dec. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	7,622.37	32,440	+3,560
CAL YR 2002. . . . . . . . . . . . . . . . . . . .	-	-	-21,770
Jan. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	7,624.24	35,220	+2,780
Feb. 28 . . . . . . . . . . . . . . . . . . . . . . . . .	7,625.98	37,960	+2,740
Mar. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	7,628.62	42,360	+4,400
Apr. 30 . . . . . . . . . . . . . . . . . . . . . . . . .	7,635.63	55,310	+12,950
May 31. . . . . . . . . . . . . . . . . . . . . . . . . .	7,646.68	79,130	+23,820
June 30 . . . . . . . . . . . . . . . . . . . . . . . . .	7,641.97	68,530	-10,600
July 31 . . . . . . . . . . . . . . . . . . . . . . . . .	7,627.82	40,990	-27,540
Aug. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	7,616.93	25,180	-15,810
Sept. 30. . . . . . . . . . . . . . . . . . . . . . . . .	7,624.58	35,740	+10,560
WTR YR 2003. . . . . . . . . . . . . . . . . . .	-	-	+16,460