USGS Water-Year Summary 2020
08152900 Pedernales River near Fredericksburg, TX
LOCATION - Lat 30°13'13", long 98°52'10" referenced to North American Datum of 1927, Gillespie County, TX, Hydrologic Unit 12090206, on left bank at downstream side of bridge on U.S. Highway 87, 2.0 mi upstream from Mueseback Creek, 3.8 mi south of the Post Office in Fredericksburg, and 88.7 mi upstream from mouth.
DRAINAGE AREA - 369 mi².
PERIOD OF RECORD - June 1979 to May 1993, Mar. 1998 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,564.96 ft above NGVD of 1929. Radio telemeter at station. Satellite telemeter at station.
COOPERATION - Lower Colorado River Authority provides operation and maintenance of the gage and verification of stage-discharge relation at low stages. U.S. Geological Survey maintains stage-discharge relation at medium to high stages, computes and publishes streamflow record.
EXTREMES OUTSIDE PERIOD OF RECORD - The flood of Aug. 2, 1978, which is the highest since 1907, reached a stage of 41.6 ft (discharge not determined). The highest known discharge was 64,000 ft³/s, June 1, 1979, gage height, 34.4 ft, from floodmark, from rating curve extended above a discharge measurement of 42,300 ft³/s.