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USGS Water-Year Summary 2024
08180500 Medina River near Riomedina, TX
LOCATION - Lat 29°29'52.8", long 98°54'19.8" referenced to North American Datum of 1983, Medina County, TX, Hydrologic Unit 12100302, on left bank at bridge at Haby's Crossing, 0.9 mi downstream from Bexar-Medina-Atascosa Counties Water Control and Improvement District No. 1 Diversion Dam, 4.2 mi northwest of Riomedina, 10.0 mi north of Castroville, 10.4 mi upstream from San Geronimo Creek, and 66.4 mi upstream from mouth.
DRAINAGE AREA - 650 mi². of which 634 mi² is above dam forming Medina Lake.
REVISIONS HISTORY - WSP 1923: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Jan. 1922 to Sept. 1934 (daily record of flow over dam and monthly or annual record of seepage under dam), Jan. 1953 to Sept. 1973, Jan. 2001 to Sept. 30, 2007, Mar. 2017 to current (daily mean discharges less than 1,000 ft 3/s).
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 858.44 ft above NAVD of 1988 from Oct 06, 2020 to present. Prior to Oct 06, 2020, datum reported as 857.28 ft above NGVD of 1929. Prior to Sept. 30, 1934, water- stage recorder at upstream side of Medina Diversion Dam 0.9 mi upstream at different datum. Jan. 1953 to July 15, 1973, water-stage recorder on left bank 233 ft upstream from bridge at Haby's Crossing at different datum. July 27, 1973 to Sept. 30, 1973, nonrecording gage on left bank 233 ft upstream from bridge at Haby's Crossing at different datum. Satellite telemeter at station.
REMARKS - Records good, except those for estimated daily discharges, which are fair. Since installation of gage in water year 1922, 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 Medina Diversion Dam. There are several small diversions below Medina Diversion Lake. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.
