Clifton Court Forebay Reservoir
As of September 1, 2026, Clifton Court Forebay is holding 17,617 acre-ft of water — 113% of normal storage for this date. Storage data refreshed throughout the day.
Clifton Court Forebay
Clifton Court Forebay is a reservoir located in the San Joaquin Valley of California. It was created in 1969 as a part of the California State Water Project and serves as a regulating and storage facility for water that is pumped from the Sacramento-San Joaquin Delta. Its primary purpose is to provide water to the South Bay Aqueduct, which serves the Santa Clara Valley and the San Francisco Bay Area. The reservoir is fed by several rivers and streams including the San Joaquin River and the Sacramento River. It also receives water from the Sierra Nevada snowpack, which is an important source of water for California. The reservoir is used for agricultural irrigation and as a recreational facility for activities such as fishing and boating.
Daily levels at Clifton Court Forebay
Storage volume, pool elevation, and total release plotted from the operating agency's daily observations.
Storage
acre-ft · code 2
Pool Elevation
ft · code 1
Inside the reservoir
The real shoreline of this water body, with a depth model scaled so the basin holds exactly its recorded storage. Drag to orbit, scroll to zoom, and use the slider to drain and refill it. Click anywhere on the basin for the modelled depth there.
How this is built. The shoreline is the National Hydrography
Dataset polygon for this water body (“Clifton Court Forebay”),
matched to the dam by proximity and confirmed by comparing its area with the
National Inventory of Dams surface area.
Depth is modelled, not surveyed: the basin is shaped by distance from
shore — deep in open water, shallow in the bays — and scaled so its
volume equals the recorded storage. No national bathymetric survey exists for
US reservoirs. Treat the shoreline, area and volume as measured, and the depth
distribution as an informed approximation.
Above normal pool, water is shown rising within the normal-pool
shoreline. Where it would actually spread depends on the surrounding
terrain, which is not modelled here — a reservoir in a steep canyon barely
widens, one on flat ground can spread a long way. This is a depth and volume
figure, not an inundation map. Official inundation mapping for a dam
comes from its Emergency Action Plan.
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 Clifton Court Forebay -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Grant Line Cn Nr Tracy Ca | 2,430 cfs | → |
| Middle R At Middle River Ca | 5,350 cfs | → |
| Old R A Bacon Island Ca | 7,330 cfs | → |
| Marsh C A Brentwood Ca | 0 cfs | → |
| Old R A Quimby Island Nr Bethel Island Ca | 2,760 cfs | → |
| Dutch Slough Bl Jersey Island Rd A Jersey Island | 5,680 cfs | → |
About Clifton Court Forebay
What is the water level at Clifton Court Forebay Reservoir right now?
As of September 1, 2026, Clifton Court Forebay Reservoir is holding 17,617 acre-ft, about 113% of normal for this date. Pool elevation and the year-over-year trend are shown above.
Is Clifton Court Forebay Reservoir high or low right now?
Compare the percent-of-normal figure on this page: above 100% means storage is higher than the historical average for the date (a wet year), below 100% means lower (a dry year or drought). The daily-levels chart shows the current trend.
Where does the data for Clifton Court Forebay 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 below 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.
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