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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
08039100 Ayish Bayou near San Augustine, TX
LOCATION - Lat 31°23'46", long 94°09'03" referenced to North American Datum of 1927, San Augustine County, TX, Hydrologic Unit 12020005, near center of span on downstream side of bridge on State Highway 103, 3.0 mi upstream from Turkey Creek and 9.5 mi south of San Augustine.
DRAINAGE AREA - 89 mi².
REVISIONS HISTORY - WSP 1922: 1959(M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - Feb. 1959 to Sept. 1985 (daily mean discharge), Oct. 1985 to Sept. 1989 (annual maximum), Oct. 1989 to current year (peak discharges greater than base discharge).
GAGE - Water-stage recorder. Datum of gage is 190.22 ft above NGVD of 1929. Prior to June 2, 1959, nonrecording gage at same site and datum. Satellite telemeter at station.
REMARKS - No known regulation or diversions. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge since Oct. 1957, 15,900 ft³s, on Sept. 21 or 22, 1958, gage height, 17.5 ft, from floodmarks.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 42,100 ft³s, Mar. 30, 2008, gage height, 21.14 ft; no flow at times.
AVERAGE DISCHARGE FOR PERIOD OF RECORD - 26 years (water years 1960-1985), 83.7 ft³s, 12.77 in/yr, 60,640 acre-ft/yr.
