06720500 SOUTH PLATTE RIVER AT HENDERSON, CO
LOCATION.--Lat 39°55'19", long 104°52'04", in SE14NE14 sec.34, T.1 S., R.67 W., Adams County, Hydrologic Unit 10190003, on right bank 500 ft upstream from bridge on State Highway 22, and 0.2 mi northwest of Henderson.
DRAINAGE AREA.--4,768 mi2 (revised).
PERIOD OF RECORD.--May 1926 to current year. Prior to October 1933, monthly discharge only, published in WSP 1310. Statistical summary computed for 1976 to current year, subsequent to completion of Chatfield Dam. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=06720500
REVISED RECORDS.--WSP 1310: 1934-36(M). WSP 1730: Drainage area. WDR C0-88-1: 1986.
GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 4999.12 ft above NGVD of 1929. See WSP 1710 or 1730 for history of changes prior to June 1, 1960. June 1, 1960, to May 10, 1969, water-stage recorder at site 1,200 ft upstream at datum 5.00 ft higher. May 11 to Oct. 2, 1969, nonrecording gage at site 500 ft downstream at datum 3.00 ft higher. Oct. 3, 1969 to Jan. 15, 1986, at present site, at datum 3.00 ft higher.
REMARKS.--Records good except for flows above 2,990 ft3/s, which are fair, and estimated daily discharges, which are poor. Natural flow of stream affected by transmountain diversions, storage reservoirs, ground-water withdrawals, diversions for irrigation of about 253,000 acres, and return flow from irrigated areas.
COOPERATION.--Records collected and computed by Colorado Division of Water Resources and reviewed by Geological Survey.
a Average discharge for 48 years (water years 1927-74), 366 ft3/s; 265,200 acre-ft/yr, prior to completion of Chatfield Dam.
d Maximum discharge and stage for period of record, 33,000 ft3/s, May 6, 1973, gage height, 11.67 ft, from rating curve extended above 7,200 ft3/s, partly on basis of flow-over-road measurement of peak flow; maximum gage height, 12.93 ft, Jun 17, 1965, site and datum then in use.