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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
07124400 TRINIDAD LAKE NEAR TRINIDAD, CO
LOCATION - Lat 37°08'28", long 104°33'05" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.27, T.33 S., R.64 W., Las Animas County, CO, 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.
REVISIONS HISTORY - WDR CO-78-1: 1977(M). WDR CO-83-1: 1981-82 (contents). WDR CO-89-1: 1988 (contents).
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1977 to current year.
GAGE - Water-stage recorder with satellite telemetry and staff gage. 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.
COOPERATION - Capacity tables provided by U.S. Army Corps of Engineers.
REMARKS - Water year 2014; estimated days are less accurate than the rest of the published record. Water year 2015; estimated days are less accurate than the rest of the published record. Water year 2016; estimated days are less accurate than the rest of the published record. Water year 2017; estimated days are less accurate than the rest of the published record. Water year 2018; no estimated daily values. Water year 2019; no estimated daily values. Water year 2020; no estimated daily values. Water year 2021; estimated days are less accurate than the rest of the published record. Water year 2022; estimated days are less accurate than the rest of the published record. Water year 2023; estimated days are less accurate than the rest of the published record. Reservoir is formed by a rock and earth fill 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.
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.
