USGS Water-Year Summary 2020
07250550 ARKANSAS RIVER AT JAMES W. TRIMBLE LOCK AND DAM NEAR VAN BUREN, AR
LOCATION - Lat 35°20'56", long 94°17'54" referenced to North American Datum of 1983, in NE 1/4 NE 1/4 sec.28, T.8 N., R.31 W., Sebastian County, AR, Hydrologic Unit 11110104, on dam, and at river mile 308.9.
DRAINAGE AREA - 151,000 mi². of which 22,200 mi² is probably noncontributing.
- WSP 1211: 1934-36. WSP 1561: 1554. WDR Arkansas 1970: Drainage area.
PERIOD OF RECORD - Oct 1927 to current year. Prior to Oct 1969, published as "07250500 Arkansas River at Van Buren", and Oct 1969 to Sep 1988, published as "at Dam No. 13", near Van Buren. Gage height records collected from 1879 to Dec 1955 at Fort Smith, 16.3 mi upstream, are contained in reports of National Weather Service.
GAGE - Water-stage and gate position recorder. Datum of gage is at NGVD of 1929 (levels by U.S. Army Corps of Engineers). Prior to Oct 1, 1934, nonrecording gage, and Oct 1, 1934 to Dec 20, 1969, recording gage at site 7.9 mi upstream at datum 372.36 ft higher.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since at least 1833, that of Apr 16, 1945, and maximum discharge since at least 1833, that of May 12, 1943. Flood in Jun 1833 reached a stage of 38.0 ft on Fort Smith gage, from records collected by National Weather Service. Flood of Apr 16, 1927, reached a stage of 35.0 ft, former site and datum, from information by local resident.
EXTREMES FOR PERIOD PRIOR TO REGULATION - Annual mean prior to regulation, water years 1928 to 1969, 30,200 ft³/s.
Maximum discharge for period of record 850,000 ft³/s May 12, 1943
Maximum gage height for period of record 38.10 ft Apr 16, 1945, at former site and datum
PERIOD OF RECORD - Oct 1927 to current year.