USGS Water-Year Summary for Site 08146000

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	00060 Discharge(Max.,Min.,Mean)
	00065 Gage height(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

08146000 San Saba River at San Saba, TX

LOCATION - Lat 31°12'47", long 98°43'09" referenced to North American Datum of 1927, San Saba County, TX, Hydrologic Unit 12090109, on left bank near left downstream end of bridge on State Highway 16, 1.2 mi north of San Saba, 2.7 mi upstream from Mill Creek, 4.8 mi downstream from China Creek, and 16.8 mi upstream from mouth.

DRAINAGE AREA - 3,046 mi² of which 7 mi² probably is noncontributing.

REVISIONS HISTORY - WSP 458: 1915-16. WSP 1512: 1918-19(M), 1922, 1931(M), 1935. WSP 1922: 1917. WDR TX-81-3: Drainage area. WDR TX-00-4: 1992.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Dec. 1904 to Dec. 1906 (gage heights only), Sept. 1915 to Sept. 1993, and Oct. 1997 to current year. Published as "near San Saba" Dec. 1904 to Dec. 1906 and Sept. 1915 to Aug. 1930. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Sept. 1947 to Feb. 1949, Nov. 1958 to Sept. 1969. BIOCHEMICAL DATA: Sept. 1962 to Sept. 1969. SEDIMENT DATA: Sept. 1964. PERIOD OF DAILY RECORD, Water-Quality.-- WATER TEMPERATURE: Sept. 1962 to Sept. 1969.

GAGE - Water-stage recorder. Datum of gage is 1,162.21 ft. above NAVD88. Prior to May 17, 2023, the datum of gage was 1,162.16 ft. above NGVD of 1929. See WSP 1922 for brief history of changes prior to July 8, 1953. From Oct. 1956 to Sept. 1993, at site 250 ft. to right and supplementary water-stage recorder 2,780 ft. to right of main channel gage used for flood flows at same datum. 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, supplements low-flow measurements, and computes and publishes the streamflow record.

REMARKS - Since water year 1963, at least 10% of contributing drainage area has been regulated. Many diversions above station for irrigation and municipal use affect low flows. No flow at times. Some records listed in the period of record may not be available electronically.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 6, 1899, reached a stage of 36.7 ft, present site and datum, from information by local residents.

EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1916-1962: Maximum discharge, 203,000 ft³/s, July 23, 1938, gage height, 39.30 ft, from floodmarks, at site then in use, adjusted to present datum, from rating curve extended above 40,600 ft³/s on basis of slope-area measurement of 203,000 ft³/s; no flow at times in 1918, 1930, 1954-56.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 47 years (water years 1916-1962) prior to completion of Brady Creek Reservoir, 248 ft³/s (179,900 acre-ft/yr).