Hetch Hetchy Res A Hetch Hetchy Ca reservoir
Hetch Hetchy Res A Hetch Hetchy Ca
Hetch Hetchy Reservoir, located in California's Yosemite National Park, is a crucial source of water for the San Francisco Bay Area. The reservoir was created in 1923 when the O'Shaughnessy Dam was built across the Tuolumne River. The hydrology of the area is primarily influenced by the Sierra Nevada Mountains and the Pacific Ocean, which provide a reliable and consistent snowpack that feeds the water supply. The Hetch Hetchy Reservoir is fed by the Tuolumne River and also receives water from the Cherry Creek and Falls Creek watersheds. The water from the reservoir provides drinking water to over 2.6 million people and supports agricultural and recreational activities. Despite controversy over the dam's construction, the Hetch Hetchy Reservoir has become an essential resource for California's Bay Area.
Daily levels at Hetch Hetchy Res A Hetch Hetchy Ca
Storage volume, pool elevation, and total release plotted from the operating agency's daily observations.
Reservoir storage, acre-ft
ac-ft · code 00054
Lake or reservoir water surface elevation above NGVD 1929, ft
ft · code 62614
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Hetch Hetchy Res A Hetch Hetchy Ca -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Tuolumne R Nr Hetch Hetchy Ca | 1,570 cfs | → |
| Eleanor C Nr Hetch Hetchy Ca | 440 cfs | → |
| Lk Eleanor Div To Cherry Lake Nr Hetch Hetchy Ca | 1 cfs | → |
| Cherry C Bl Valley Dam Nr Hetch Hetchy Ca | 144 cfs | → |
| Tuolumne R A Grand Cyn Of Tuolumne Ab Hetch Hetchy | 2,670 cfs | → |
| Tuolumne R Ab Early Intake Nr Mather Ca | 1,680 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hetch Hetchy Res A Hetch Hetchy Ca.
⚓ Boat launches
More boat launches →⛺ Campgrounds
- Hetch Hetchy Backpackers Camp
- Lake Eleanor Campground
- Dimond O Campground
- Diamond O
- Cherry Valley Campground
- White Wolf - Yosemite National Park
🎣 Fishing spots
More fishing →🛶 Paddle runs
- Headwaters Near The Tuolumne And Mariposa County Lines To Western Boundary Of Yosemite National Park
- Clavey River From 3n01 To Cottonwood Road
- Clavey River At Confluence Of Bell And Lily Creeks To 3n01
- Lilly Creek (Source At Chewing Gum Lake And Y Meadow Lake) To One-Tenth Mile Downstream Of Coffin Hollow
- One-Tenth Mile Downstream Of Coffin Hollow To Confluence With Bell Creek And Clavey River
🛡 More reservoirs
More reservoirs →Track Hetch Hetchy Res A Hetch Hetchy Ca in the Snoflo app
Save this reservoir as a favorite and set push alerts when storage crosses a threshold (e.g. "alert me at 80% of normal").
About Hetch Hetchy Res A Hetch Hetchy Ca
Where does the data for Hetch Hetchy Res A Hetch Hetchy Ca come from?
Daily storage, pool elevation, and release rates are sourced from USGS, USBR, and USACE monitoring stations. Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
Storage observations are updated daily by the operating agency. The 15-day weather forecast refreshes throughout the day. Snoflo caches and renders the most recent observation -- check the "as of" timestamp on the storage card.
What does the Hazard hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this reservoir, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Hetch Hetchy Res A Hetch Hetchy Ca.