Lake Natoma (nimbus Dam) Reservoir
As of August 9, 2026, Lake Natoma (Nimbus Dam) is holding 7,815 acre-ft of water — 99% of normal storage for this date. Storage data refreshed throughout the day.
Lake Natoma (Nimbus Dam)
Lake Natoma is a man-made lake located in California, created by the construction of Nimbus Dam in 1955. The lake is fed by the American River and is part of the Folsom Lake State Recreation Area. It covers an area of 4,200 acres and has a maximum depth of 60 feet. The lake plays a crucial role in the hydrology of the region by providing drinking water, irrigation water, and flood control. It is also a popular recreational destination and offers activities such as swimming, boating, fishing, and hiking. The surface flow providers for Lake Natoma include the American River and its tributaries while the snowpack providers are the Sierra Nevada Mountains. The lake's water is used for agricultural purposes by farmers in the vicinity.
Daily levels at Lake Natoma (Nimbus Dam)
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
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 Lake Natoma (Nimbus Dam) -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| American R A Fair Oaks Ca | 5,020 cfs | → |
| Dry C A Vernon St Bridge A Roseville Ca | 159 cfs | → |
| Deer C Nr Cameron Park Ca | 8 cfs | → |
| Arcade C Nr Del Paso Heights Ca | · | → |
| Cosumnes R A Michigan Bar Ca | 46 cfs | → |
| Morrison C Nr Sacramento Ca | 11 cfs | → |
About Lake Natoma (Nimbus Dam)
What is the water level at Lake Natoma (nimbus Dam) Reservoir right now?
As of August 9, 2026, Lake Natoma (nimbus Dam) Reservoir is holding 7,815 acre-ft, about 99% of normal for this date. Pool elevation and the year-over-year trend are shown above.
Is Lake Natoma (nimbus Dam) 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 Lake Natoma (nimbus Dam) 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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