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USGS Water-Year Summary 2024
02400500 COOSA RIVER AT GADSDEN, AL
LOCATION - Lat 34°00'37", long 85°59'52" referenced to North American Datum of 1927, Etowah County, AL, Hydrologic Unit 03150106, near midstream in pier of Etowah County Memorial Bridge on Forrest Avenue in Gadsden, 450 ft downstream from Louisville & Nashville Railroad bridge, 1.5 mi upstream from Big Wills Creek, and at river mile 172.9.
DRAINAGE AREA - 5,805 mi².
REVISIONS HISTORY - WSP 1906: 1944, 1947-49, 195l-52, 1954, 1958. WDR AL-84-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1926 to September 1976. October 1971 to current year (flood hydrograph and gage height record only). Gage-height records collected at same site since 1890 are contained in reports of National Weather Service.
GAGE - Water-stage recorder. Datum of gage is 485.97 ft above NGVD of 1929. Prior to Oct. 1, 1926, nonrecording gage on Louisville & Nashville Railroad bridge 450 ft upstream at datum 1.15 ft higher. Oct. 1, 1926, to Mar. 31, 1932, water-stage recorder, and Apr. 1, 1932, to May 23, 1935, nonrecording gage, at present site and datum. Since May 4, 1965, auxiliary water-stage recorder 2.2 mi upstream from base gage at present datum.
REMARKS - Record considered good. Since December 1949, flow regulated by Allatoona Reservoir (station 02393500) 158.8 mi upstream and since April 1961, by Weiss Reservoir (stations 02399499) 53.3 mi upstream. Gage in pool of H. Neely Henry Reservoir.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Apr. 6, 1886, reached a stage of 37.9 ft, from floodmarks established by U.S. Army Corps of Engineers, discharge, 115,000 ft³/s, from rating curve extended above 80,000 ft³/s. Flood of July 15, 1916, reached a stage of 32.7 ft, discharge, 85,000 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 76,900 ft³/s, Apr. 11, 1936, gage height, 31.13 ft; minimum daily, 100 ft³s, many days in water year 1967.
AVERAGE DISCHARGE FOR PERIOD OF RECORD - 50 years, (water years 1927-76) 9,468 ft³/s, 22.15 in/yr.
