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TUOLUMNE RIVER - HETCH HETCHY RESERVOIR (HETC1)

Latitude: 37.95º N	Longitude: 119.79º W	Elevation: 3870 Feet
Location: Tuolumne County in California		Bulletin Group: San Joaquin		River Group: San Joaquin

Issuance Time:

Jul 10, 2025 at 8:32 AM PDT

Please Note:

Flow data on this product are unregulated / full natural flow.

Historical Flows

Water Year Seasonal (Apr-Jul)

Year		Annual Flow	3-Year Mean
1971	31536000000	703.2
1972	63072000000	523.9
1973	94694400000	801.8	676.3
1974	126230400000	916.4	747.4
1975	157766400000	781.7	833.3
1976	189302400000	293.0	663.7
1977	220924800000	205.8	426.8
1978	252460800000	1158.8	552.5
1979	283996800000	723.3	696.0
1980	315532800000	1149.1	1010.4
1981	347155200000	454.2	775.6
1982	378691200000	1339.5	980.9
1983	410227200000	1645.2	1146.3
1984	441763200000	1025.0	1336.6
1985	473385600000	538.1	1069.4
1986	504921600000	1178.3	913.8
1987	536457600000	316.4	677.6
1988	567993600000	391.4	628.7
1989	599616000000	622.4	443.4
1990	631152000000	385.3	466.4
1991	662688000000	469.6	492.4
1992	694224000000	355.4	403.4
1993	725846400000	981.3	602.1
1994	757382400000	372.1	569.6
1995	788918400000	1458.5	937.3
1996	820454400000	933.3	921.3
1997	852076800000	1158.4	1183.4
1998	883612800000	1117.0	1069.6
1999	915148800000	797.5	1024.3
2000	946684800000	693.5	869.3
2001	978307200000	455.9	649.0
2002	1009843200000	627.5	592.3
2003	1041379200000	712.8	598.7
2004	1072915200000	596.5	645.6
2005	1104537600000	1034.3	781.2
2006	1136073600000	1192.5	941.1
2007	1167609600000	368.9	865.3
2008	1199145600000	524.6	695.4
2009	1230768000000	757.6	550.4
2010	1262304000000	822.3	701.5
2011	1293840000000	1378.6	986.1
2012	1325376000000	384.4	861.7
2013	1356998400000	469.8	744.3
2014	1388534400000	332.2	395.5
2015	1420070400000	264.8	355.6
2016	1451606400000	785.3	460.8
2017	1483228800000	1746.7	932.3
2018	1514764800000	647.9	1060.0
2019	1546300800000	1070.1	1154.9
2020	1577836800000	348.6	688.8
2021	1609459200000	278.9	565.9
2022	1640995200000	500.3	376.0
2023	1672531200000	1543.3	774.2
2024	1704067200000	617.0	886.9
2025	1735689600000	559.3	906.5

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ323)

Today: Sunny. Highs 71 to 83. Southeast winds up to 10 mph shifting to the southwest in the afternoon.

Tonight: Clear. Lows 48 to 62. Northwest winds up to 10 mph shifting to the east after midnight.

Saturday: Sunny. Highs 71 to 83. East winds up to 5 mph shifting to the southwest in the afternoon.

Saturday Night: Clear. Lows 48 to 62. West winds up to 10 mph shifting to the northeast after midnight.

Sunday: Sunny. Highs 72 to 84. Northeast winds up to 5 mph shifting to the southwest in the afternoon.

Sunday Night through Tuesday Night: Clear. Lows 44 to 62. Highs 70 to 85.

Wednesday: Sunny. Highs 67 to 79.

Wednesday Night: Mostly clear. Lows 44 to 56.

Thursday: Sunny. Highs 66 to 78.

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