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USGS Water-Year Summary 2024
08171300 Blanco River near Kyle, TX
LOCATION - Lat 29°58'45", long 97°54'35" referenced to North American Datum of 1927, Hays County, TX, Hydrologic Unit 12100203, on left bank 800 ft downstream from Tarbutton Ranch House (Hatchett Ranch), 2.2 mi southwest of Kyle, 4.2 mi downstream from Halifax Creek, and 6.3 mi upstream from bridge on U.S. Highway 81.
DRAINAGE AREA - 412 mi².
REVISIONS HISTORY - WSP 1923: 1957-58, 1960(M). WSP 2123: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1956 to current year.
PERIOD OF RECORD, Water-Quality.--
CHEMICAL DATA: July 1965.
BIOCHEMICAL DATA: July 1965.
GAGE - Water-stage recorder. Datum of gage is 620.692 ft. above NAVD of 1988. The NAVD of 1988 datum was determined by a level 2 GNSS survey (Reference Frame NAD_83 (2011) (EPOCH:2010.0000). (GEOID18) by USGS on February 24,2025 and tied to RM15. Prior to February 24, 2025, the datum of gage was 620.120 ft.
REMARKS - Records fair for the Water Year. No known regulation. Small diversions above station for irrigation. Most of the low flow of the Blanco River enters the Edwards and associated limestones in the Balcones Fault Zone which crosses the basin upstream from this station and below Blanco River at Wimberley (station 08171000). Some records listed in the "Period of Record" for surface water and water quality may not be available electronically. No flow at times.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since at least 1882, about 40 ft in May 1929, from information by local residents (discharge, 139,000 ft³/s). Flood of Sept. 11, 1952, reached a stage of 38.0 ft (discharge, 115,000 ft³/s).
WATER-QUALITY RECORDS
PERIOD OF RECORD -
CHEMICAL DATA: July 1965.
BIOCHEMICAL DATA: July 1965.
