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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 CA
River Group: San Joaquin
Issuance Time: Jun 16 2025 at 6:31 AM PDT
Please Note:Flow data on this product are unregulated / full natural flow.
Historical Flows
RankYearAnnual Flow3-Year Mean
197131536000000703.2
197263072000000523.9
197394694400000801.8 676.3
1974126230400000916.4 747.4
1975157766400000781.7 833.3
1976189302400000293.0 663.7
1977220924800000205.8 426.8
19782524608000001158.8 552.5
1979283996800000723.3 696.0
19803155328000001149.1 1010.4
1981347155200000454.2 775.6
19823786912000001339.5 980.9
19834102272000001645.2 1146.3
19844417632000001025.0 1336.6
1985473385600000538.1 1069.4
19865049216000001178.3 913.8
1987536457600000316.4 677.6
1988567993600000391.4 628.7
1989599616000000622.4 443.4
1990631152000000385.3 466.4
1991662688000000469.6 492.4
1992694224000000355.4 403.4
1993725846400000981.3 602.1
1994757382400000372.1 569.6
19957889184000001458.5 937.3
1996820454400000933.3 921.3
19978520768000001158.4 1183.4
19988836128000001117.0 1069.6
1999915148800000797.5 1024.3
2000946684800000693.5 869.3
2001978307200000455.9 649.0
20021009843200000627.5 592.3
20031041379200000712.8 598.7
20041072915200000596.5 645.6
200511045376000001034.3 781.2
200611360736000001192.5 941.1
20071167609600000368.9 865.3
20081199145600000524.6 695.4
20091230768000000757.6 550.4
20101262304000000822.3 701.5
201112938400000001378.6 986.1
20121325376000000384.4 861.7
20131356998400000469.8 744.3
20141388534400000332.2 395.5
20151420070400000264.8 355.6
20161451606400000785.3 460.8
201714832288000001746.7 932.3
20181514764800000647.9 1060.0
201915463008000001070.1 1154.9
20201577836800000348.6 688.8
20211609459200000278.9 565.9
20221640995200000500.3 376.0
202316725312000001543.3 774.2
20241704067200000617.0 886.9
20251735689600000 593.9 918.1

Location Photographs

ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ323)
Today: Sunny. Highs 43 to 57. West winds 5 to 15 mph with gusts to around 40 mph.

Tonight: Colder, clear. Lows 25 to 41. Northwest winds 5 to 15 mph with gusts to around 30 mph shifting to the east after midnight.

Sunday: Not as cool. Sunny. Highs 50 to 64. Southwest winds up to 15 mph.

Sunday Night: Mostly clear. Lows 31 to 45. West winds 5 to 10 mph shifting to the northeast after midnight.

Monday: Mostly sunny. Highs 52 to 66. East winds up to 10 mph shifting to the southwest in the afternoon.

Monday Night: Partly cloudy. Lows 33 to 49.

Tuesday and Tuesday Night: Mostly clear. Highs 57 to 71. Lows 37 to 53.

Wednesday through Friday: Clear. Highs 62 to 79. Lows 40 to 55.