USGS Water-Year Summary 2021
07069000 BLACK RIVER AT POCAHONTAS, AR
LOCATION - Lat 36°15'15", long 90°58'13" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 sec.27, T.19 N., R.1 E., Randolph County, AR, Hydrologic Unit 11010009, near right bank on downstream side of bridge on U.S. Hwy 67 at Pocahontas, 2.2 mi downstream from Fourche River, 6.4 mi downstream from Current River, 18.1 mi upstream from Spring River, and at river mile 90.1.
DRAINAGE AREA - 4,840 mi². 4,865 mi² determined using StreamStats
- WSP 927: Drainage area.
PERIOD OF RECORD - Operated as a continuous-record station Oct 1936 to Sep 1970 and Oct 2000 to current year. Operated as a partial-record station (annual maximum only) Sep 1970 to Oct 1994. Operated as a stage-only station Oct 1995 to Sep 1999.
GAGE - Water-stage recorder. Datum of gage is 241.81 ft above NGVD of 1929. Prior to Jul 15, 1937, nonrecording gage at site 0.3 mi upstream at same datum. Jul 15, 1937 to Jul 23, 1940, nonrecording gage at present site and datum.
EXTREMES OUTSIDE PERIOD OF RECORD - A flood in Aug, 1915, reached a stage of 27.90 ft, from floodmarks and information by the U.S. Army Corps of Engineers. The flood of Apr 17, 1927, reached a stage of 25.90 ft, discharge 80,000 ft³/s.