USGS Water-Year Summary for Site 13010065

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

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USGS Water-Year Summary 2023

13010065 SNAKE RIVER ABOVE JACKSON LAKE AT FLAGG RANCH, WY

LOCATION - Lat 44°05'56", long 110°40'03" referenced to North American Datum of 1983, Teton County, WY, Hydrologic Unit 17040101, Flagg Ranch quad., Grand Teton National Park, on left bank 50 ft upstream from State Highway 89 bridge, 2 mi. downstream from the south boundary of Yellowstone National Park, 600 ft. downstream from the confluence with Sheffield Creek.

DRAINAGE AREA - 486 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1983 to current year. Prior to 1988 water year, published as station 13010200.

GAGE - Water-stage recorder and crest-stage gage. Datum of the gage is 6,801.61 ft above NGVD of 1929, (levels by U.S. Coast and Geodetic Survey). A nonrecording cantilever chain gage was used from 1913-18 at a site 2.5 mi upstream at a different datum. In 1918, an auxiliary chain gage was installed at the current site and read periodically. Water-stage recorder installed July 1921 at the current site at a different datum and operated until July 1925. Records probably not comparable.

EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 11,300 ft³/s June 5, 1996; maximum gage height, 10.75 ft, June 5. 1996, from backwater; minimum discharge, 120 ft³/s Sept. 11, 2016, gage height, 1.95 ft.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - WATER TEMPERATURE: November 1983 to September 1985, June 1994 to September 1996 (no winter records), June to November 2002, May 2022 to current year.

INSTRUMENTATION - Sutron Aquatemp thermistor.

REMARKS - Water-temperature records represent water temperature at sensor within 0.2 °C. Maximum and minimum recorded values in the EXTREMES paragraphs may have occurred during days of partial record and may not appear in the daily values tables.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum recorded, 23.3°C, July 13, 2002; minimum recorded, -0.10°C, many days, most years.