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USGS Water-Year Summary 2024
08249000 CONEJOS RIVER NEAR LASAUSES, CO
LOCATION - Lat 37°18'01", long 105°44'47" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.02, T.35 N., R.11 E., Conejos County, CO, Hydrologic Unit 13010005, on left bank of main channel 125 ft downstream from bridge on State Highway 158, 2.1 mi north of Lasauses, and on left bank of secondary channel 1,550 ft upstream from bridge on State Highway 158, 1.5 mi north of Lasauses, and both sites are about 1.0 mi upstream from mouth and 13 mi southeast of Alamosa.
DRAINAGE AREA - 887 mi².
REVISIONS HISTORY - WSP 1312: 1932 (monthly discharge and runoff), 1934 (M). February 2021: 2019, Maximum daily mean discharge.
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 1921 to current year. Monthly discharge only for some periods, published in WSP 1312. Prior to October 1, 1966, published as "at mouth, near La Sauses" or "near La Sauses."
GAGE - Two water-stage recorders with satellite telemetry. Datum of gage on main (north) channel is 7,495.02 ft above NGVD of 1929, and on secondary (south) channel is 7,499.86 ft above NGVD of 1929 (levels by U.S. Bureau of Reclamation). Main channel: Apr. 11 to Sept. 30, 1937, at datum 1.00 ft higher. See WSP 1312 and 1732 for history of changes prior to Apr. 11, 1937. South channel: May 4, 1936, to Oct. 13, 1965, at site 1,600 ft downstream at datum 3.96 ft lower. Oct. 14, 1965 to Dec. 12, 2007, at site 1,320 ft downstream at datum 2.97 ft lower. See WSP 1312 and 1732 for history of changes prior to May 4, 1936.
COOPERATION - Records collected and computed by Colorado Division of Water Resources and reviewed by Geological Survey.
REMARKS - Water year 2014; records good except for estimated daily discharges, which are poor. Water year 2015; records good except for estimated daily discharges, which are poor. Water year 2016; records good except for estimated daily discharges, which are poor. Water year 2017; records good except for gage heights above 4.00 ft in main channel, which are fair, and estimated daily discharges, which are poor. Water year 2018; records good except for flows below 1.0 ft³/s, and estimated daily discharges, which are poor. Water year 2019; records good except for flows below 1.0 ft³/s, and estimated daily discharges, which are poor. Water year 2020; records good except for flows below 1.0 ft³/s, and estimated daily discharges, which are poor. Water year 2021; records good except for flows below 1.0 ft³/s, and estimated daily discharges, which are poor. Water year 2022; records good except for flows below 1.0 ft³/s, and estimated daily discharges, which are poor. Water year 2023; records good except for flows below 1.0 ft³/s, and estimated daily discharges, which are poor. Natural flow of stream affected by diversions for irrigation, groundwater withdrawals, and return flows from irrigated areas. Flows regulated to some extent by Platoro Reservoir (station 08244500) about 83 mi upstream since Nov. 7, 1951.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Oct. 5, 1911, is the greatest since at least 1854, from information obtained from local residents in 1959.
