USGS Water-Year Summary for Site 08100000

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

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

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USGS Water-Year Summary 2023

08100000 Leon River near Hamilton, TX

LOCATION - Lat 31°47'19", long 98°07'16" referenced to North American Datum of 1927, Hamilton County, TX, Hydrologic Unit 12070201, at downstream side of bridge on U.S. Highway 281, 2.2 mi upstream from Mesquite Creek, 3.6 mi downstream from Bear Creek, 5.9 mi north of Hamilton, and 172.9 mi upstream from mouth.

DRAINAGE AREA - 1,891 mi².

REVISIONS HISTORY - WDR TX-76-2: Drainage area. The maximum discharge for the 2006 water year has been revised to 437 ft³/s, Mar. 20, 2006, gage height, 8.93 ft.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Jan. 1925 to Sept. 1931, Sept. 1960 to Sept. 1996, Oct. 2007 to current year (daily mean discharge), Oct. 1996 to Sept. 2007 (peak discharges greater than base discharge).

GAGE -

Water-stage recorder. Satellite telemetry at station.

Datum of the gage: 955.38 ft NAVD88 based on a Level 2 Static GNSS survey processed through OPUS, Ref Frame NAD83 (2011)(EPOCH:2010.0000) ITRF2014 (EPOCH:2024.2234) and Geoid18. The survey was completed March 22nd, 2024, while occupying a TRM the was referenced to local datum via differential levels.

Prior to 3/22/2024, the datum of the gage was 955.38 ft NGVD29. Jan. 7, 1925, to Sept. 30, 1931, nonrecording gage 1.4 mi downstream at datum 1.87 ft higher. Sept. 1 to Nov. 22, 1960, nonrecording gage at same site and at 5.00 ft higher datum. Nov. 22, 1960, to Sept. 30, 1972, recording gage at same site and at 5.00 ft higher datum.

REMARKS - Records fair. Since water year 1954, at least 10% of contributing drainage area has been regulated. There are numerous diversions above station for irrigation, municipal supply, and industrial uses. At times flow is affected by discharge from floodwater-retarding structures controlling runoff from 43.9 mi². 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 - Maximum stage since 1858, 38.4 ft in May 1908 and Dec. 1913; flood in Sept. 1911 reached a stage of 37.0 ft, all at present site and datum, from information by local residents. The flood in Oct. 1959 reached a stage of 34.1 ft, present datum.

EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1925-1931: Maximum discharge, 5,680 ft³/s, May 22, 1931, gage height, 20.00 ft; no flow at times.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 6 years (water years 1926-31) prior to regulation by Lake Leon, 130 ft³/s (94,200 acre-ft/yr).