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USGS
Water Resources of Colorado


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


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U.S. Geological Survey
Water Resources of Colorado
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Last Modified: April 28, 2004