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USGS 07024500 SOUTH FORK OBION RIVER NEAR GREENFIELD, TN
Current datum of gage is 295.47 ft. above NAVD of 1988. From
October 1, 2006 to September 30, 2012 datum of gage is 295.37 ft. above
NGVD of 1929. Prior to October 1, 2006 datum is 5 ft. higher