USGS Water-Year Summary 2022
07134100 BIG SANDY CREEK NEAR LAMAR, CO
LOCATION - Lat 38°06'51", long 102°29'00" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.21, T.22 S., R.45 W., Prowers County, CO, Hydrologic Unit 11020011, on right bank 35 ft upstream from State Highway 196, 950 ft upstream from mouth, and 7.5 mi east of Lamar.
DRAINAGE AREA - 3,216 mi² of which 585 mi² probably is noncontributing.
- WDR-US-2011: Drainage area.
PERIOD OF RECORD - February 1968 to September 1982, July 1995 to current year.
GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Elevation of gage is 3,545 ft above NGVD of 1929, from topographic map. Prior to June 30, 1977, at datum 1.00 ft higher.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 17, 1965, reached a discharge of 3,600 ft³/s, from slope-area measurement of peak flow 0.5 mi upstream from station. Flood of Aug. 21, 1965, reached a stage of 9.93 ft, from floodmarks, discharge unknown.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,850 ft³/s, May 4, 1999, from rating curve extended above 1,470 ft³/s on basis of flow-through culvert analysis with flow over road measurement at gage height 9.48 ft, gage height, 9.66 ft.