06721000 SOUTH PLATTE RIVER AT FORT LUPTON, CO
LOCATION.--Lat 40°06'58", long 104°49'05", in SW14SE14 sec.19, T.2 N., R.66 W., Weld County, Hydrologic Unit 10190003, on right bank 2 ft downstream from county road 18 bridge, 3.0 mi downstream from Big Dry Creek, and 2.5 mi north of Fort Lupton.
DRAINAGE AREA.--5,044 mi2 (revised). Area at 1957 gage location is 5,007 mi2 (revised).
PERIOD OF RECORD.--May to September 1906, April 1929 to September 1957, April to September 2003 (seasonal records only). Prior to October 1933 monthly discharge only, published in WSP 1310. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=06721000
GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 4,860 ft above NGVD of 1929, from topographic map. Oct. 3, 1947 to Sept. 30, 1957, water-stage recorder at site 3.9 mi upstream at different datum. See WSP 1730 for history of changes prior to Oct. 3, 1947.
REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow affected by transmountain diversions, storage reservoirs, ground-water withdrawals, diversions for irrigation, and return flow from irrigated areas. Several measurements of specific conductance and water temperature were obtained and are published in the "Supplemental Water-Quality Data for Gaging Stations" section of this report.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,000 ft3/s, April 26, 1942, from rating curve extended above 6,700 ft3/s; maximum gage height, 7.57 ft, May 9, 1957, site and datum then in use; minimum daily, 4.4 ft3/s, October 29, 1956.
EXTREMES FOR CURRENT YEAR (seasonal only).--Maximum discharge during period April to September, 3,210 ft3/s, May 11, gage height, 7.52 ft; minimum daily, 101 ft3/s, Aug. 22.