ARKANSAS RIVER BASIN

07124400 TRINIDAD LAKE NEAR TRINIDAD, CO

LOCATION.--Lat 37°08'28", long 104°33'05", in NE14SW14 sec.27, T.33 S., R.64 W., Las Animas County, Hydrologic Unit 11020010, in valve house near center of dam on Purgatoire River and 3.2 mi southwest of courthouse in Trinidad.

DRAINAGE AREA.--672 mi2.

PERIOD OF RECORD.--August 1977 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07124400

REVISED RECORDS.--WDR CO-78-1: 1977(M). WDR CO-83-1: 1981-82 (contents). WDR CO-89-1: 1988 (contents).

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 6,073.64 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers); gage readings have been reduced to elevations above NGVD of 1929.

REMARKS.--Reservoir is formed by a rock and earthfill dam completed in 1977. Storage began Aug. 19, 1977. Recreation pool reached June 4, 1979. All figures represent total contents from area-capacity table effective Nov. 1, 1999, and based on a 1999 resurvey by the U.S. Army Corp of Engineers. Total capacity at top of parapet wall, 180,000 acre-ft at elevation 6,284.00 ft. Maximum pool, 167,700 acre-ft at elevation 6,279.30 ft. Top of flood control storage, 123,200 acre-ft at elevation 6,260.00 ft. Capacity at high crest of spillway, 119,100 acre-ft at elevation 6,258.00 ft. Capacity at notch crest of spillway, 91,300 acre-ft at elevation 6,243.00 ft. Top of irrigation storage, 71,000 acre-ft at elevation 6,230.00 ft. Recreation pool, 14,895 acre-ft at elevation 6,171.86 ft. Elevation of no contents, 6,115.00 ft. No dead storage. Reservoir is used for flood control, recreation, storage for irrigation, and sediment retention.

COOPERATION.--Capacity tables provided by U.S. Army Corps of Engineers.

EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 72,800 acre-ft, Aug. 8, 1999, elevation, 6,230.35 ft; minimum contents since recreation pool was reached, 4,260 acre-feet, Oct. 5, 1992, elevation, 6,142.41 ft.

EXTREMES FOR CURRENT YEAR.--Maximum contents, 20,000 acre-ft, May 2-7, maximum elevation, 6,180.20 ft, May 6; minimum contents, 11,200 acre-ft, Sept. 27-30, mimimum elevation, 6,164.46 ft, Sept. 28.

Capacity table

(Elevation, in feet, and contents, in acre-feet, effective Nov. 1, 1999)

Elevation	Capacity	Elevation	Capacity	Elevation	Capacity
6,150.0	5,660	6,180.0	19,900	6,210.0	45,800
6,155.0	7,320	6,185.0	23,400	6,215.0	51,500
6,160.0	9,220	6,190.0	27,200	6,220.0	57,600
6,165.0	11,400	6,195.0	31,400	6,225.0	64,100
6,170.0	13,900	6,200.0	35,800	6,230.0	71,000
6,175.0	16,700	6,205.0	40,600	6,235.0	78,400

Reservoir storage, acre feet 

WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

DAILY OBSERVATION AT 2400 HOURS

DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP
1	13,200	14,000	14,500	15,200	15,900	16,500	17,700	19,900	16,100	13,600	12,700	11,600
2	13,300	14,000	14,600	15,200	15,900	16,500	17,700	20,000	15,900	13,600	12,700	11,600
3	13,300	14,000	14,600	15,200	15,900	16,500	17,800	20,000	15,800	13,500	12,600	12,400
4	13,300	14,100	14,600	15,200	15,900	16,600	17,900	20,000	15,800	13,500	12,600	12,200
5	13,400	14,100	14,600	15,300	16,000	16,600	17,900	20,000	15,800	13,400	12,600	11,600
6	13,400	14,100	14,600	15,300	16,000	16,600	18,000	20,000	15,500	13,400	12,600	11,400
7	13,400	14,100	14,700	15,400	16,000	16,600	18,000	19,900	15,100	13,400	12,600	11,800
8	13,500	14,100	14,700	15,400	16,000	16,700	18,100	19,800	14,700	13,500	12,600	11,800
9	13,500	14,200	14,700	15,400	16,000	16,700	18,100	19,700	14,300	13,400	12,500	11,700
10	13,500	14,200	14,700	15,400	16,000	16,700	18,200	19,500	13,800	13,400	12,500	11,800
11	13,600	14,200	14,700	15,400	16,100	16,700	18,200	19,400	13,600	13,400	12,400	11,800
12	13,600	14,200	14,800	15,400	16,100	16,800	18,200	19,200	13,700	13,300	12,400	11,700
13	13,600	14,300	14,800	15,400	16,200	16,800	18,300	19,000	13,700	13,200	12,300	11,500
14	13,600	14,300	14,800	15,500	16,200	16,800	18,300	18,800	13,700	13,200	12,300	11,500
15	13,700	14,300	14,800	15,500	16,300	16,800	18,400	18,500	13,700	13,200	12,200	11,500
16	13,700	14,300	14,900	15,500	16,300	16,800	18,400	18,300	14,000	13,100	12,100	11,600
17	13,700	14,400	14,900	15,500	16,300	16,800	18,400	17,900	14,000	13,100	12,000	11,600
18	13,700	14,400	14,900	15,500	16,300	16,900	18,500	17,600	13,900	13,000	12,000	11,600
19	13,800	14,400	14,900	15,600	16,400	17,000	18,600	17,300	13,900	13,000	12,000	11,600
20	13,800	14,400	14,900	15,600	16,300	17,000	18,800	17,000	13,800	13,000	12,000	11,600
21	13,800	14,400	14,900	15,600	16,300	17,100	18,900	16,800	13,700	13,000	11,900	11,600
22	13,800	14,400	14,900	15,600	16,300	17,200	19,000	16,500	13,600	13,200	11,900	11,500
23	13,900	14,400	15,000	15,700	16,300	17,300	19,200	16,400	13,600	13,200	11,900	11,500
24	13,900	14,400	15,000	15,700	16,300	17,300	19,400	16,400	13,500	12,900	11,800	11,400
25	13,900	14,500	15,000	15,700	16,400	17,400	19,500	16,400	13,600	12,800	11,800	11,400
26	13,900	14,500	15,000	15,700	16,400	17,400	19,600	16,200	13,700	12,700	11,800	11,300
27	13,900	14,500	15,100	15,800	16,400	17,500	19,600	16,000	13,700	12,800	11,700	11,200
28	13,900	14,500	15,100	15,800	16,400	17,500	19,700	15,900	13,800	12,900	11,600	11,200
29	13,900	14,500	15,100	15,800	---	17,500	19,800	15,900	13,700	13,000	11,700	11,200
30	13,900	14,500	15,100	15,800	---	17,600	19,900	15,900	13,600	12,900	11,800	11,200
31	14,000	---	15,100	15,900	---	e17,600	---	16,000	---	12,800	11,700	---
MAX	14,000	14,500	15,100	15,900	16,400	17,600	19,900	20,000	16,100	13,600	12,700	12,400
MIN	13,200	14,000	14,500	15,200	15,900	16,500	17,700	15,900	13,500	12,700	11,600	11,200