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USGS Water-Year Summary 2024
07026040 OBION RIVER AT U.S. HIGHWAY 51 NEAR OBION, TN
LOCATION - Lat 36°14'26.74", long 89°13'03.27" referenced to North American Datum of 1927, Obion County, TN, Hydrologic Unit 08010202, on right downstream bank, at end of main channel bridge on U.S. Highway 51, 3.2 mi northeast of Trimble, 2.0 mi southwest of Obion and 1.6 river miles downstream of the former gage location, Obion River at Obion.
DRAINAGE AREA - 1,875 mi².
REVISIONS HISTORY - WSP 1211: 1930, 1943. WSP 2120: Drainage area. On June 18, 2013, the maximum discharge for Water Year 2011 was revised and is documented in the report for 2012 http://wdr.water.usgs.gov/wy2012/pdfs/07026040.2012.pdf
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1929 to September 1958, October 1966 to September 1995, October 2001 to current year. Gage height and discharge records at this site from 1964 to 1975 are in reports of U.S. Army Corps of Engineers. Prior to Oct. 1990 published as "at Obion" (07026000).
GAGE - Data collection platform. Datum of gage is 244.37 ft above NAVD of 1988, (Reference Frame NAD_83 (2011) (EPOCH:2010.0000) GEOID18).
Prior to April 24, 2024, the datum of gage was assumed to be 245.26 ft NAVD of 1988. However, was never updated in the Monitor Location Registry.
Prior to November 2020, the datum of gage was assumed to be 245.17 ft NGVD of 1929. However, was never updated in the Monitor Location Registry.
Prior to Oct. 1990 water-stage recorder at site 1.6 mi upstream at a datum 1.31 ft higher (levels by the U.S. Army Corps of Engineers).
Prior to Oct. 1, 1932, nonrecording gage at site 1.6 mi upstream at datum 6.31 ft higher; Oct. 1, 1932 to Aug. 2, 1939, nonrecording gage, and Aug. 3, 1939, to Sept. 1958, water-state recorder at site 1.6 mi upstream at datum 16.31 ft higher.
COOPERATION - Gage operated jointly with the U.S. Army Corps of Engineers, Memphis District.
REMARKS - Records fair, except for estimated discharges, which are poor and other periods as noted. The period November 15, 2017 to June 27, 2018 is considered to be poor. During high stages, the peak and recession side of peaks are affected by backwater, and return flow from flooded fields. These periods are shown as estimated and are considered poor.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 99,500 ft³/s, Jan. 24, 1937 gage height, 40.4 ft present datum; minimum under conditions of no backwater, 230 ft³/s, Oct. 7-9, 1943, minimum daily discharge, 15 ft³/s, backwater from Mississippi River, Feb. 4, 1937, reverse flow of 57 ft³/s, measured by current meter on that date.
