PLATTE RIVER BASIN

06737500 HORSETOOTH RESERVOIR NEAR FORT COLLINS, CO

LOCATION.--Lat 40°36'00", long 105°10'06", in NW14SW14, sec.6, T.7 N., R.69 W., Larimer County, Hydrologic Unit 10190007, on right bank near abutment of Horsetooth Dam on tributaries to Cache la Poudre River, 4.8 mi west of city hall in Fort Collins.

RESERVOIR ELEVATIONS AND CONTENTS RECORDS

PERIOD OF RECORD.--April 1951 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=06737500

GAGE.--Nonrecording gage read at irregular intervals from 1 to 10 days. Datum of gage is 5,430.00 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 earth and rockfill dike and dams closing openings in subsequent valleys between hogbacks; storage began
Jan. 10, 1951; dams completed July 21, 1949. Usable capacity, 143,500 acre-ft above elevations 5,320 ft, invert of channel from Spring Canyon Dam,
5,310 ft, invert of channel from Dixon Canyon Dam, 5,270 ft, trashrack sill of outlet at Soldier Canyon Dam, and below maximum water-surface elevation, 5,430 ft, 6 ft below crest of Satanka Dike. Dead storage, 7,003 acre-ft. Figures given represent usable contents. Water is diverted from Colorado River basin through Alva B. Adams tunnel for supplemental irrigation supply to Cache la Poudre River. Water-quality sampling at two sites in reservoir.

COOPERATION.--Records provided by U.S. Bureau of Reclamation.

EXTREMES FOR PERIOD OF RECORD.--Maximum contents observed, 148,400 acre-ft, June 26-27, 1995, elevation, 5,429.36 ft; minimum observed,
0 acre-ft, several times in 2001, 2002, and 2003 water years at various elevations during repairs to dam and outlet structure, minimum elevation,
5,286.77 ft, Oct. 6, 2001; minimum contents observed under normal operating conditions, 9 acre-ft, Nov. 16-30, 1977, elevation, 5,270.25 ft; no storage prior to Apr. 18, 1951.

EXTREMES (AT 0800) FOR CURRENT YEAR.--Maximum contents observed, 46,830 acre-ft, Sept. 24, elevation, 5,365.83 ft; minimum observed,
0 acre-ft, Oct. 20, elevation, 5,302.22 ft during repairs to dam and outlet structure when reservoir was drawn down below dead storage.

MONTHEND ELEVATION AND CONTENTS, AT 0800, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Elevation (feet)	Contents (acre-feet)	Change in contents (acre-feet)
Sept. 30. . . . . . . . . . . . . . . . . . . . . . . . .	5,312.59	3,930	-
Oct. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	5,308.42	2,070	-1,860
Nov. 30 . . . . . . . . . . . . . . . . . . . . . . . . .	5,320.74	8,110	+6,030
Dec. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	5,326.80	11,710	+3,610
CAL YR 2002. . . . . . . . . . . . . . . . . . . .	-	-	+2,530
Jan. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	5,332.86	15,750	+4,040
Feb. 28 . . . . . . . . . . . . . . . . . . . . . . . . .	5,340.31	21,320	+5,570
Mar. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	5,350.32	30,110	+8,790
Apr. 30 . . . . . . . . . . . . . . . . . . . . . . . . .	5,351.05	30,820	+710
May 31. . . . . . . . . . . . . . . . . . . . . . . . . .	5,354.08	33,840	+3,030
June 30 . . . . . . . . . . . . . . . . . . . . . . . . .	5,355.89	35,720	+1,880
July 31 . . . . . . . . . . . . . . . . . . . . . . . . .	5,356.96	36,840	+1,130
Aug. 31 . . . . . . . . . . . . . . . . . . . . . . . . .	5,359.64	39,740	+2,900
Sept. 30. . . . . . . . . . . . . . . . . . . . . . . . .	5,365.01	45,860	+6,110
WTR YR 2003. . . . . . . . . . . . . . . . . . .	-	-	+41,930