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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 6:30 AM PDT
Please Note:Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.

Flow data on this product are unregulated / full natural flow.
2025 Water Year Trend Plot
Tabular View  |  Select a Different Water Year:  
Note: The chart below functions better in landscape orientation.
Created with Highcharts 9.2.1Daily Observed Volumes​(1000s Ac-Ft)Water Year 2025 - Day (mm/dd)Water Year Volumes (1000s Ac-​Ft)Chart context menuTUOLUMNE - HETCH HETCHY, NR (HETC1) 06/16/2025​Median Forecast: 594 kaf | 76% of Mean | 89% of MedianCreated: 06/16/2025 at 06:30 AM PDTMean: 778 kaf​Mean: 778 kafMean: 778 kaf​Mean: 778 kafMedian: 671 kaf​Median: 671 kafMedian: 671 kaf​Median: 671 kafMay 12​12.1 kaf​May 12​12.1 kafRecord Low: ​206 kaf in 1977​Record Low: ​206 kaf in 1977Record Low: ​206 kaf in 1977​Record Low: ​206 kaf in 1977Record High: ​1750 kaf in 2017​Record High: ​1750 kaf in 2017Record High: ​1750 kaf in 2017​Record High: ​1750 kaf in 2017WY Volume MeanWY Volume MedianWY to Date ObsWY to Date MeanWY to Date MedianDaily ObsObs PeakWY Vol Fcst 50%WY Vol Fcst 25/75%WY Vol Fcst 10/90%WY Vol Fcst Max/MinRecord LowRecord HighSnow Model Updates Observed to Date Percent of Mean: 89% (520 kaf) Water Year to Date Mean: 587 kaf​ Historical Water Year Vol Max: 1750 kaf in 2017 Historical Water Year Vol Min: 206 kaf in 1977​ This product only considers meteorological uncertainty and does not account for hydrologic uncertainty.​ Means/medians are based on the period of Water Years 1980 through 2023.​ Legend entries below can be toggled on/off.01.22.43.64.867.28.49.610.81213.214.410/01​202411/01​202412/01​202401/01​202502/01​202503/01​202504/01​202505/01​202506/01​202507/01​202508/01​202509/01​202509/30​2025020040060080010001200140016001800200022002400

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Official 7 Day National Weather Service Forecast   (CAZ323)
Today: Breezy, sunny. Highs 54 to 66. Southwest winds 5 to 15 mph increasing to 10 to 25 mph in the afternoon. Gusts up to 50 mph.

Tonight: Colder, clear. Lows 29 to 41. Southwest winds 10 to 15 mph with gusts to around 45 mph shifting to the south with gusts to around 30 mph after midnight.

Saturday: Sunny. Highs 44 to 58. Southwest winds 5 to 15 mph with gusts to around 35 mph.

Saturday Night: Colder, clear. Lows 25 to 41. West winds 5 to 15 mph with gusts to around 30 mph shifting to the east 5 to 10 mph after midnight.

Sunday: Warmer, sunny. Highs 51 to 65. Southeast winds up to 10 mph shifting to the southwest in the afternoon.

Sunday Night through Tuesday Night: Mostly clear. Lows 31 to 52. Highs 55 to 72.

Wednesday through Thursday: Clear. Highs 62 to 79. Lows 41 to 55.