USGS Water-Year Summary 2021
06903700 South Fork Chariton River near Promise City, IA
LOCATION - Lat 40°48'02", long 93°11'32" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 SW 1/4 sec.05, T.69 N., R.20 W., Wayne County, IA, Hydrologic Unit 10280201, on right bank 20 ft downstream from bridge on County Highway S50, 4.3 mi northwest of Promise City, 1.3 mi downstream from Jordan Creek, 16.0 mi upstream from confluence with Chariton River, and 54.0 mi upstream from Iowa-Missouri state line.
DRAINAGE AREA - 168 mi².
PERIOD OF RECORD - Occasional low-flow measurements, water years 1958-1966, published as "near Bethlehem"; monthly discharge measurements, March 1965 to September 1967; discharge records from October 1967 to current year.
GAGE - Water-stage recorder. Datum of gage is 913.70 ft above National Geodetic Vertical Datum of 1929 (U.S. Army Corps of Engineers benchmark).
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of September 21, 1965, reached a stage of 25.5 ft, from high-water mark, discharge about 18,000 ft³/s.