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USGS Water-Year Summary 2024
08110500 Navasota River near Easterly, TX
LOCATION - Lat 31°10'12", long 96°17'51" referenced to North American Datum of 1927, Leon County, TX, Hydrologic Unit 12070103, at left downstream end of bridge on U.S. Highway 79, 1.0 mi upstream from Missouri Pacific Railroad Co. bridge, 7.0 mi northeast of Easterly, and 105.7 mi upstream from mouth.
DRAINAGE AREA - 968 mi².
REVISIONS HISTORY - WSP 898: 1924, 1926-27, 1928(M), 1929-30, 1931(M). WSP 1512: 1932(M), 1936. WDR TX-76-2: Drainage area. WDR TX- 78-2: 1974(M), 1977.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Mar. 1924 to current year.
PERIOD OF RECORD, Water-Quality.--
CHEMICAL DATA: Feb. 1966 to Aug. 1985.
BIOCHEMICAL DATA: Feb. 1966 to Aug. 1973.
SEDIMENT DATA: Oct. 1968 to Sept. 1973.
RADIOCHEMICAL DATA: Nov. 1980 to Jun. 1981.
GAGE - Water-stage recorder. Datum of gage is 271.46 ft above NGVD of 1929. Prior to June 11, 1932, nonrecording gage at railroad bridge 1.0 mi downstream at 19.86-foot higher datum. June 11, 1932, to Sept. 30, 1978, water-stage recorder 46 ft upstream at 5.00-foot higher datum. Satellite telemeter at station.
REMARKS - Records good. Since water year 1961, at least 10% of contributing drainage area has been regulated. There are numerous diversions above station for irrigation, municipal supply, and oil field operation. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since 1845, 29 ft in June 1899, from information by local residents (discharge, 90,000 ft³/s), from rating curve extended above 60,000 ft³/s.
EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS, 1924-1960: Maximum discharge, 60,300 ft³/s May 2, 1944 (gage height, 27.13 ft at datum then in use); no flow at times.
AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 36 years (water years 1925-60), 406 ft³/s, 294,100 acre-ft/yr.
