USGS Water-Year Summary 2021
08085500 Clear Fork Brazos River at Fort Griffin, TX
LOCATION - Lat 32°55'58.72", long 99°12'55.40" referenced to North American Datum of 1983, Shackelford County, TX, Hydrologic Unit 12060104, Gage located on upstream right bank on Highway 283, 1.7 mi upstream from Mill Creek, and 74.6 mi upstream from mouth.
DRAINAGE AREA - 4,026 mi². ,revised. (Area at site used prior to June 4, 2009, 3988 mi², revised.)
- WSP 1392: 1949. WDR TX-76-2: Drainage area.
PERIOD OF RECORD - Dec. 1923 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,164.09 ft above NGVD of 1929. Prior to June 4, 2009, gage at site approximately 1 mi upstream and at datum 1174.09 ft above NGVD of 1929. Prior to June 23, 1932, nonrecording gage at same site and datum. Satellite telemeter at station.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in Sept. 1900 reached a stage of 38.0 ft, from information by local resident.
EXTREMES FOR PERIOD PRIOR TO REGULATION -
WATER YEARS 1925-1938: Maximum discharge, 33,600 ft³/s Sept. 10, 1932 (gage height, 35.09 ft) from rating curve extended above 31,500 ft³/s; no flow at times.
AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 14 years (water years 1925-38) prior to completion of Fort Phantom Hill Reservoir, 303 ft³/s (219,500 acre-ft/yr).
PERIOD OF RECORD -
CHEMICAL DATA: Nov. 1967 to Sept. 1979, Oct. 1981 to Sept. 1984, Nov. 2010 to current year.
BIOCHEMICAL DATA: Nov. 1967 to Sept. 1973, Nov. 2010 to current year.
BIOLOGICAL DATA: Jan. 2011 to current year.
ORGANIC CARBON DATA: Jan. 2011 to current year.
SEDIMENT DATA: Nov. 2010 to current year.