USGS Water-Year Summary 2022
07337000 RED RIVER AT INDEX, AR
LOCATION - Lat 33°33'07", long 94°02'28" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 sec.07, T.14 S., R.28 W., Miller County, AR, Hydrologic Unit 11140106, on right bank downstream of northbound bridge on U.S. Hwy 71 at Index, 2.2 mi south of Ogden, 20.6 mi upstream from Little River, and at river mile 485.3.
DRAINAGE AREA - 48,000 mi² of which 5,900 mi² probably is noncontributing.
- WSP 1211: Drainage area.
PERIOD OF RECORD - Jul 1936 to current year. Gage-height records collected at same site since 1917 are contained in reports of National Weather Service.
Water-stage recorder. Datum of gage is 246.55 ft above NAVD of 1988, (Reference Frame NAD_83 (2011) (EPOCH:2010.0000), (GEOID18).
Prior to August 11, 2022, Datum of Gage was 246.87 ft above NGVD of 1929.
Prior to Dec 1939, nonrecording gage; Dec 1939 to Jul 1979, water-stage recorder at site 500 ft downstream at present datum.
EXTREMES FOR PERIOD PRIOR TO REGULATION - Annual mean prior to regulation, water years 1937 to 1943, 11,970 ft³/s.
Maximum discharge for period of record 297,000 ft³/s Feb 23, 1938.
Maximum gage height for period of record 34.25 ft Feb 23, 1938, from graph based on gage readings.
PERIOD OF RECORD - Water years 1947 to 1956, Apr 1980 to current year.