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USGS Water-Year Summary 2024
03593500 TENNESSEE RIVER AT SAVANNAH, TN
LOCATION - Lat 35°13'29", long 88°15'26" referenced to North American Datum of 1927, Hardin County, TN, Hydrologic Unit 06040001, on right bank at upstream side of bridge on U.S. Highway 64, at Savannah, 16.8 mi downstream from Pickwick Landing Dam, and at mile 189.9.
DRAINAGE AREA - 33,140 mi².
REVISIONS HISTORY - WSP 853: Drainage area. WSP 1306: 1936 (monthly runoff). WSP 2110: 1966. WRD TN-73-1: 1973-96. WRD TN- 74-1: 1973. WRD TN-85-1: 1985. WRD TN-90-1: 1989.
SURFACE-WATER RECORDS
PERIOD OF RECORD - September 1930 to December 8, 2016, (stage only after 2005). Gage-height records collected in this vicinity since June 1905, are in reports of U.S. Weather Bureau.
GAGE - Data collection platform. Datum of gage is 350.06 ft above NGVD of 1929 (Levels by Tennessee Valley Authority). Prior to Oct. 1, 1992, at datum 50.06 ft lower, prior to Apr. 7, 1945, at datum 8.45 ft lower. Oct. 1, 1948 to Apr. 13, 1978 and Oct. 1, 1989 to Sept. 30, 2005, (discontinued) auxiliary water-stage recorder on downstream end of lockwall in lower pool at Pickwick Landing Dam Apr. 13, 1978 to Sept. 30, 1989, auxiliary water-stage recorder over tailwater elevation well adjacent to the powerhouse which is an integral part of Pickwick Landing Dam, both sites 16.8 mi. upstream from base gage at same datum. Apr. 5, 1937, to Jan. 31, 1939, auxiliary non-recording gage 4.0 mi downstream and Feb. 1, 1939, to Sept. 30, 1948, water-stage recorder 4.3 mi downstream from base gage at same datum.
REMARKS - Records good unless otherwise noted. Slight regulation since 1924 by Wilson Lake and increasing regulation since 1936 as other reservoirs have been built above station.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since 1867, 101.2 ft, Mar. 21, 1897, datum then in use, from floodmarks, discharge, 450,000 ft³/s, from rating curve extended above 320,000 ft³/s. Flood of Jan. 2, 1927, reached a stage of 92.7 ft datum then in use, discharge, 349,000 ft³/s. Minimum stage since 1905, 38.8 ft datum then in use, Sept. 8, 1925.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 507,000 ft³/s, Mar. 17,1973, maximum stage, 96.11 ft., Mar. 17, 1973, datum then in use; minimum daily flow, 60 ft³/s, Arp. 23, 1966.
