USGS Water-Year Summary 2019
07069190 MAMMOTH SPRING AT MAMMOTH SPRING, AR
LOCATION - Lat 36°29'52", long 91°32'08" referenced to North American Datum of 1983, in SE 1/4 SW 1/4 sec.05, T.21 N., R.5 W., Fulton County, AR, Hydrologic Unit 11010010,
PERIOD OF RECORD - Mar 1981 to current year. Prior to Oct 1992 published under Station Number 07069200. Occasional low-flow measurements made beginning in 1924.
GAGE - Water-stage recorder. Datum of gage is 500.90 ft above NGVD of 1929.