USGS Water-Year Summary for Site 08169500

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

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

08169500 Guadalupe River at New Braunfels, TX

LOCATION - Lat 29°41'52", long 98°06'23" referenced to North American Datum of 1927, Comal County, TX, Hydrologic Unit 12100202, in second floor of abandoned turbine building at Comal Mills, 300 ft downstream from Missouri Pacific Railroad, 0.4 miles upstream from IH-35, 0.7 mile downstream from mouth of Comal River, 23.7 mi downstream from Canyon Lake, and at mile 279.3.

DRAINAGE AREA - 1,652 mi².

REVISIONS HISTORY - WDR US-2006: 1999 (M)

SURFACE-WATER RECORDS

PERIOD OF RECORD - Mar. 1898 to 1902, (gage-height or discharge measurements only), Jan. 1915 to Dec. 1927 (daily mean discharge), Apr. 1974 to Sept. 1999 (annual peak discharge), Oct. 1999 to current year (daily mean gage height). PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Oct. 1998 to Dec. 2008. BIOCHEMICAL DATA: Oct. 1982, Feb. 1998 to Dec. 2008. BIOLOGICAL DATA: Feb. 1998. PESTICIDE DATA: Feb. 1998. SEDIMENT CHEMISTRY DATA: Feb. 1998. RADIOCHEMISTRY DATA: Feb. 1998 to Dec. 2008. STABLE ISOTOPE DATA: Dec. 2008.

GAGE - Water-stage recorder. Datum of gage is 572.55 ft above NGVD of 1929. Satellite telemeter at station.

REMARKS - Water Year records good. Since re-activation of gage in 1974, at least 10% of the contributing drainage area has been regulated. Small diversions for irrigation above this station. 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 stage since at least 1845, 39.5 ft, Aug. 1869 and in Dec. 1913, from information by local residents. Maximum discharge, 101,000 ft³/s, June 15, 1935 (gage height unknown).

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 152,000 ft³/s, Oct. 17, 1998, gage height, 38.54 ft, from indirect measurement of peak flow.

EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1915-1928: Maximum discharge, 56,600 ft³/s, Sept. 10, 1921, gage height, 28.60 ft; minimum discharge 270 ft³/s, July 20, 1918.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 12 years (water years 1916-27), 751 ft³/s (544,100 acre-ft/yr).

WATER-QUALITY RECORDS

PERIOD OF RECORD - BIOCHEMICAL DATA: Oct. 1982. BIOLOGICAL DATA: Feb. 1998. SEDIMENT CHEMISTRY DATA: Feb. 1998.