Water level
3,756.06ft NGVD29
-2.68 ft in 7 daysOct 11Oct 18Oct 25
Sep 25Oct 10Oct 25
Reading from Oct 26, 2026.
Hetch Hetchy Reservoir was at 3,756.06 ft on October 26, falling 2.68 ft over the past week.
CaliforniaReservoir, 2,008 acres, Tuolumne County
Hetch Hetchy Reservoir conditions today
Right now on Hetch Hetchy
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Best window
0pm to 0pm
score
Wind
00kt
Gusts 00
Direction
NE
Blowing from
Air temp
00°F
High
Rain
Dry%
next 6 hours
Water level
3,756.06ft
Down 2.68 ft this week
Sailing
CheckingReading the forecast
Kayak and SUP
CheckingReading the forecast
Power boating
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Fishing
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Hour by hour
Next 24 hours
Wind and gusts0 to 30+ ktScoreGood, caution, stay ashoreNightBest windowArrows point where the wind blows to.
Outlook. Monday: WSW wind 4 to 9 kt, gusts to 15 kt, high near 64°F. Tuesday: SW wind 4 to 7 kt, gusts to 12 kt, high near 64°F.
7-day wind forecastLive radar
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LightHeavy
Last hour of NOAA MRMS radar, 1 km resolution. Map data © OpenStreetMap contributors, OpenMapTiles, OpenFreeMap.
Lake facts
- Type
- Reservoir
- State
- California
- County
- Tuolumne County
- Surface area
- 2,008 acres
- Elevation
- 3,773 ft
- USGS gauge
- 11275500, Hetch Hetchy Reservoir A Hetch Hetchy CA
- Coordinates
- 37.9547° N, 119.7502° W
Background reading: Hetch Hetchy Reservoir on Wikipedia
About Hetch Hetchy Reservoir
Set in Tuolumne County, California, Hetch Hetchy Reservoir is a 2,008-acre reservoir. The water surface sits about 3,773 ft above sea level.
Water level on this page comes from USGS gauge 11275500 (Hetch Hetchy Reservoir A Hetch Hetchy CA), about 2 mi from the middle of the lake. Wind, gusts and rain come from the National Weather Service forecast grid that covers the water.
Mid-sized lakes like this one tend to have shifty, gusty wind near shore and steadier pressure in the middle, which is why gust spread matters as much as average speed. Reservoir levels move with releases and inflow, so ramps and beaches can change week to week. The water level page tracks that day by day.
The go or no-go calls above are a starting point, not a guarantee. Read how we score conditions, and always check local rules and posted warnings before you launch.
Hetch Hetchy Reservoir questions
Is it windy on Hetch Hetchy Reservoir today?
The National Weather Service forecast for the lake from October 26: Monday: WSW wind 4 to 9 kt, gusts to 15 kt, high near 64°F. The panel at the top of this page refreshes the current wind, gusts and direction when you open it and turns them into a call for sailing, paddling, power boating and fishing.
What is the water level at Hetch Hetchy Reservoir right now?
Hetch Hetchy Reservoir was at 3,756.06 ft on October 26, falling 2.68 ft over the past week.
How big is Hetch Hetchy Reservoir?
Hetch Hetchy Reservoir covers about 2,008 acres (3.1 square miles) of surface water.
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