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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
09371000 MANCOS RIVER NEAR TOWAOC, CO
LOCATION - Lat 37°01'39", long 108°44'27" referenced to North American Datum of 1927, Montezuma County, CO, Hydrologic Unit 14080107, Ute Mountain Ute Indian Reservation, on left bank 700 ft. upstream from bridge on U.S. Highway 491, 2.0 mi. north of Colorado-New Mexico State line, 6.0 mi. upstream from Aztec Creek, and 12 mi. south of Towaoc, CO.
DRAINAGE AREA - 526 mi².
REVISIONS HISTORY - WSP 1733: 1924 (monthly figures only). WDR CO-83-3: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1920 to September 1943, February 1951 to current year. Monthly discharge only for some periods, published in WSP 1313.
GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Datum of gage is 5,055.98 ft above NGVD of 1929. See WSP 1713 or 1733 for history of changes prior to Mar. 11, 1954.
REMARKS - Water year 2014; records good except for flows below 10 ft³/s, and estimated daily discharges, which are poor. Water year 2015; records fair except for estimated daily discharges, which are poor. Water year 2016; records fair except for estimated daily discharges, which are poor. Water year 2017; records fair except for estimated daily discharges, which are poor. Water year 2018; records fair except for estimated daily discharges, which are poor. Water year 2019; records poor. Water year 2020; records fair except for estimated daily discharges, which are poor. Water year 2021; no estimated daily discharges. Records fair except for flows above 300 ft³/s, which are poor. Water year 2022; records fair except for flows above 300 ft³/s, and estimated daily discharges, which are poor. Water year 2023; records poor. Diversions for irrigation of about 10,000 acres upstream from station. One diversion upstream from station for irrigation of about 100 acres downstream from station. Flow regulated to some extent by Jackson Gulch Reservoir, 40 mi upstream, capacity 10,000 acre-ft, since Mar. 1949.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,300 ft³/s, Oct. 14, 1941, from rating curve extended above 200 ft³/s, on basis of slope-area measurement of peak flow, gage height, 7.30 ft, present site and datum.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - April 2019 to current year (seasonal records only).
INSTRUMENTATION - Tipping-bucket rain gage with satellite telemetry. Datum of gage is 5,055.98 ft above NGVD of 1929, from topographic map.
EXTREMES FOR PERIOD OF RECORD - (seasonal only) Maximum daily precipitation, 0.82 inches, Sept. 22, 2022.
REMARKS - Gage operated seasonally, April through September.
