USGS Water-Year Summary for Site 08167800

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

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

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USGS Water-Year Summary 2024

08167800 Guadalupe River at Sattler, TX

LOCATION - Lat 29°51'32", long 98°10'47" referenced to North American Datum of 1927, Comal County, TX, Hydrologic Unit 12100202, on right bank 200 ft upstream from Horseshoe Falls, 0.8 mi north of Sattler, 1.8 mi downstream from Canyon Dam, 2.3 mi upstream from Heiser Hollow, 11.2 mi north of New Braunfels, and at mile 301.2.

DRAINAGE AREA - 1,436 mi².

REVISIONS HISTORY - WSP 2123: Drainage area. WDR US-2009: 2002(M).

SURFACE-WATER RECORDS

PERIOD OF RECORD - Mar. 1960 to current year. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Dec. 1963, Feb. 1981 to Aug. 1982, Feb. 1990 to Dec. 1996, June 1998. BIOCHEMICAL DATA: Dec. 1963, Feb. 1981 to Aug. 1982, Feb. 1990 to Dec. 1996, June 1998. BIOLOGICAL DATA: Dec. 1996, June 1998. PESTICIDE DATA: Dec. 1996, June 1998. RADIOCHEMICAL DATA: Feb. to May 1981, Dec. 1996. SEDIMENT DATA: Dec. 1996, June 1998.

GAGE - Water-stage recorder and concrete control. Datum of gage is 742.695 ft above NAV of 1988. Satellite telemeter at station.

REMARKS - Water Year records good, except for estimated daily discharges which are poor and other periods as noted. Since deliberate impoundment in June 1964, at least 10% of contributing drainage area has been regulated. Small diversions above station for irrigation. No flow July 31 to August 6, 1962 (result of temporary stream closure during construction of Canyon Dam). Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood in July 1869 (stage unknown) has not been exceeded since that date; flood in July 1900 (stage unknown) exceeded 39 ft; maximum stage since at least 1904, 39 ft in July 1932 and June 1935, from information by local residents.

EXTREMES FOR PERIOD OF RECORD - Maximum peak flow from indirect measurement, 70,000 cfs on Jul 6, 2002. Maximum peak stage from flood mark, 36.36 ft on Jul 6, 2002.

EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1960-1963: Maximum discharge, 20,800 ft³/s Oct. 29, 1960 (gage height, 12.20 ft); no flow July 31 to Aug. 6, 1962.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 3 years (water years 1961-63) 288 ft³/s (208,500 acre-ft/yr).

WATER-QUALITY RECORDS

PERIOD OF RECORD - CHEMICAL DATA: Dec. 1963, Feb. 1981 to Aug. 1982, Feb. 1990 to Dec. 1996, June 1998. BIOCHEMICAL DATA: Dec. 1963, Feb. 1981 to Aug. 1982, Feb. 1990 to Dec. 1996, June 1998. BIOLOGICAL DATA: Dec. 1996, June 1998. PESTICIDE DATA: Dec. 1996, June 1998. RADIOCHEMICAL DATA: Feb. 1981 to May 1981, Dec. 1996. SEDIMENT DATA: Dec. 1996, June 1998.