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USGS Water-Year Summary 2024
05508000 SALT RIVER NEAR NEW LONDON, MO
LOCATION - Lat 39°36'45", long 91°24'26.5" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 sec.36, T.56 N., R.5 W., Ralls County, MO, Hydrologic Unit 07110007, on left bank near downstream end of bridge on north bound side of dual U.S. Highway 61, 9.9 mi downstream from Clarence Cannon Dam, 2.0 mi north of New London, 8.0 mi upstream from Spencer Creek, and at mile 35.5.
DRAINAGE AREA - 2,480 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Feb 1922 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 476.93 ft above NAVD88. Prior to Apr 7, 1931, nonrecording gage 400 ft upstream at datum 0.03 ft higher; Apr 7, 1931 to Jan 17, 1935, nonrecording gage at site 180 ft upstream at datum 0.04 ft lower; Jan 17, 1935 to Apr 1985, water-stage recorder 400 ft upstream same datum.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS MO Water Science Center. Flow completely regulated by Mark Twain Lake, capacity of 1,860,000 acre-ft, 10 mi upstream since Sep 1979 and by Monroe City Lake (station 05507820) upstream on Ely Creek. Five percent of the drainage area, 130 mi², is natural drainage not regulated.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Jul 14, 1858, reached a stage of 27.6 ft, present site and datum, based on comparison of Jun 1928 flood crest at stone marker, 1.0 mi downstream of gage.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 107,000 ft³/s, Apr 22, 1973; gage height, 31.8 ft.
