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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: Jul 09 2025 at 7:47 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.
4x5-Day Probability Plot
Tabular 4 x 5-Day Streamflow Volume Data
Observed
Peak 1-Day Streamflow Volume:
(April 1 at 12 UTC to Current Date at 12 UTC)
  Observed
05/12/2025
12.1kaf
  

Forecast
Peak 1-Day Streamflow Volume:
(Current Date at 12 UTC to August 1 at 12 UTC)
10% (Max)
07/10/2025
0.5kaf
25%
07/10/2025
0.5kaf
50% (Prob)
07/10/2025
0.5kaf
75%
07/10/2025
0.5kaf
90% (Min)
07/10/2025
0.5kaf
Tabular 5-Day Volume Accumulations (1000s of Acre-Feet)
Probability07/09 to 07/1407/14 to 07/1907/19 to 07/2407/24 to 07/29
10%2.4 kaf2.1 kaf1.8 kaf1.6 kaf
25%2.4 kaf2.1 kaf1.8 kaf1.6 kaf
50%
(Median)
2.4 kaf2.1 kaf1.8 kaf1.6 kaf
75%2.4 kaf2.1 kaf1.8 kaf1.6 kaf
90%2.4 kaf2.1 kaf1.8 kaf1.6 kaf

Location Photographs

ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ323)
Today: Sunny. Highs 63 to 77. Southwest winds up to 15 mph with gusts to around 30 mph.

Tonight: Clear. Lows 40 to 56. Southwest winds up to 10 mph with gusts to around 25 mph shifting to the east after midnight.

Thursday: Sunny. Highs 68 to 80. East winds up to 10 mph shifting to the west in the afternoon.

Thursday Night: Clear. Lows 45 to 59. West winds 5 to 10 mph shifting to the east after midnight.

Friday: Sunny. Highs 69 to 83. East winds up to 10 mph shifting to the southwest in the afternoon.

Friday Night through Monday: Clear. Lows 46 to 62. Highs 71 to 84.

Monday Night: Mostly clear. Lows 48 to 62.

Tuesday: Sunny. Highs 71 to 83.