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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
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.
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 1979 to May 1993, Mar. 1998 to current year.
GAGE -
Water-stage recorder. Satellite telemetry at station.
Datum of gage: 1565.081 ft NAVD88 based on a Level 2 Static GNSS survey processed through OPUS, Ref Frame: NAD83 (2011)(EPOCH:2010.0000) ITRF2014 (EPOCH:2024.1987) and Geoid 18. The survey was completed on March 13th, 2024 while occupying a TRM referenced to local gage datum via differential levels.
Prior to 3/13/2024, the Datum of the gage was 1,564.96 ft NGVD29.
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.
REMARKS - No known regulation or diversions. No flow at times. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.
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.
