USGS Water-Year Summary for Site 08194000

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

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Water year 2024: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2024

08194000 Nueces River at Cotulla, TX

LOCATION - Lat 28°25'34", long 99°14'23" referenced to North American Datum of 1927, La Salle County, TX, Hydrologic Unit 12110105, on left bank at downstream side of bridge on U.S. Highway 81, 0.4 mi upstream from Missouri Pacific Railroad Co. bridge, 0.8 mi southwest of Cotulla, 1.0 mi upstream from Lind Dam, and at mile 216.9.

DRAINAGE AREA - 5,171 mi².

REVISIONS HISTORY - WSP 1732: 1957(M). WDR TX-83-3: Drainage area. See also PERIOD OF RECORD.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Nov. 1923 to Sept. 1926 (monthly discharge only), Oct. 1926 to current year. Gage-height records collected in this vicinity in 1914-17 and since 1922 are contained in reports of the National Weather Service. Figures of daily discharge for Oct. 31, 1923 to Sept. 30, 1926, published in WSP 588, 608, and 628, have been found to be unreliable and should not be used. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: June 1964 to Jan. 1968. BIOCHEMICAL DATA: June 1964 to Dec. 1967.

GAGE - Water-stage recorder. Datum of gage is 368.188 ft. NAVD88 done by RTK on 3/14/22. 368.08 ft above NGVD of 1929. From Oct. 31, 1923, to Aug. 3, 1924, nonrecording gage at approximate site of present gage at datum 7.28 ft higher. From Aug. 4, 1924, to Nov. 19, 1934, nonrecording gage at site 5,000 ft downstream at datum 8.42 ft higher. From Nov. 20, 1934, to July 14, 1938, water-stage recorder, and July 15, 1938, to Apr. 30, 1963, nonrecording gage, at present site and datum. Satellite telemeter at station.

REMARKS - Since Mar. 1948, at least 10% of contributing drainage area has been regulated. Part of the flow of the Nueces River and its headwater tributaries enters the Edwards and associated limestones in the Balcones Fault Zone that crosses the basin between Nueces River at Laguna (station 08190000) and Nueces River below Uvalde (station 08192000). Some loss of flow into various permeable formations occurs downstream from the Balcones Fault Zone. There are many small diversions above station for irrigation. Figures of daily discharge for Oct. 31, 1923, to Sept. 30, 1926, published in WSP 588, 608, and 628, have been found to be unreliable and should not be used. No flow at times. 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 of June 19, 1899, reached a stage of 29.7 ft, from information by local residents. Maximum stage since at least 1879, that of June 18, 1935.

EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1927-1948: Maximum discharge 82,600 ft³/s June 18, 1935 (gage height 32.4 ft from floodmarks), by slope-area method; no flow at times.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 22 years (water years 1927-48), 315 ft³/s (228,000 acre-ft/yr).

WATER-QUALITY RECORDS

PERIOD OF RECORD - CHEMICAL DATA: June 1964 to Jan. 1968. BIOCHEMICAL DATA: June 1964 to Dec. 1967.