Click
to
hide
Water-Year
Summary
instructions
and
information
- 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.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
08180800 Medina River near Somerset, TX
LOCATION - Lat 29°15'43", long 98°34'52" referenced to North American Datum of 1927, Bexar County, TX, Hydrologic Unit 12100302, on left bank at downstream side of downstream bridge on State Highway 16, 2.0 mi upstream from Elm Creek, 5.0 mi downstream from Medio Creek, 5.2 mi northeast of Somerset, and 14.0 mi upstream from mouth.
DRAINAGE AREA - 967 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct. 1970 to Sept. 1995, Apr. 1997 to Sept. 30, 2004.
PERIOD OF RECORD, Water-quality.--
Chemical data: July 1998 to Aug. 2000.
Biochemical data: July 1998 to Aug. 2000.
Pesticide data: July 1998 to Aug. 2000.
Sediment data: July 1998 to Aug. 2000.
GAGE - Water-stage recorder. Datum of gage is 493.93 ft above NAVD of 1988. Prior to June 16, 1993, at site 300 ft upstream at previous datum of 493.56 ft above NGVD of 1929. Satellite telemeter at station.
REMARKS - Records good. Since installation of gage in water year 1971, at least 10% of contributing drainage area has been regulated. A large part of the streamflow is lost into the Edwards and associated limestones where the Balcones Fault crosses the basin between the upstream end of Medina Lake and about 5 mi downstream from Medina Dam, or 0.9 mi downstream from the Medina Diversion Dam. There are several small diversions below Medina Diversion Dam. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.
WATER-QUALITY RECORDS
EXTREMES FOR PERIOD OF RECORD -
SPECIFIC CONDUCTANCE: Maximum, 1010 micro siemens/cm, Nov 29, 2020; minimum, 231 micro siemens/cm, May 02, 2021. pH: Maximum, 8.7 standard units, July 4, 2020; minimum, 7.6 standard units, May 28, 2020. WATER TEMPERATURE: Maximum, 31.3°C, July 13, 2020; minimum, 4.7°C, Feb 16, 2021. DISSOLVED OXYGEN: Maximum, 14.2 mg/L, Jan 17, 2021; minimum, 5.3 mg/L, Apr 29, 2021. TURBIDITY: Maximum, 1080 FNU Apr 29, 2021; minimum, 3.7 FNU, Mar 21, 2019.
