Reservoir Report

Alpine Lake reservoir

California, USA USBR
Today high
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Tonight low
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Current storage
6,687acre-ft
% of normal
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Right now · current storage
Alpine Lake
USBR · APN
6,687 acre-ft
As of 2026-05-11
Seasonal avg
--
Record max
8,891
24h change
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Alpine Lake -- None reservoir
Alpine Lake None
About this reservoir

Alpine Lake

Alpine Lake is located in Marin County, California, and was formed in 1914 when a dam was constructed on Lagunitas Creek. The lake supplies water to the Marin Municipal Water District and is an important source of water for the region. The hydrology of the lake is characterized by a small watershed, with most of the water coming from precipitation and snowmelt. The lake is also fed by several small streams and is surrounded by dense forests. The snowpack in the winter provides a significant portion of the water for the lake. The lake is primarily used for recreational purposes, including fishing, boating, and swimming. The surrounding area is also used for agriculture, including dairy farming and crop production. The lake is an important part of the local ecosystem, serving as habitat for a variety of plant and animal species.

StateNone
OperatorUSBR
Site IDAPN
Last updated2026-05-11
Records since2021
Storage trends

Daily levels at Alpine Lake

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

Detailed forecast

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.

Hourly detail

Next 5 days, hour by hour

Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.

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Deep dive

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.

TimeConditionTemp (°F)Snow (in)Rain (in)Humidity (%)Wind (mps)Wind dir
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Long-term outlook

15-day temperature & precipitation

Daily temperatures, snow, and rain projected over the next two weeks.

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Regional inflow

Nearby streamflow gauges

USGS streamgauges around Alpine Lake -- inflows here typically show up in storage 24-72 hours later.

Track Alpine Lake 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").

FAQ

About Alpine Lake

Where does the data for Alpine Lake 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.

More reservoirs

Other water bodies near here

Snoflo-tracked reservoirs and dams within driving distance of Alpine Lake.

Premium feature

Favorites and alerts are part of Snoflo Premium. Save reservoirs, set storage thresholds, and get push notifications when conditions cross.

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Manage alerts in the Snoflo app

Custom alerts are configured in the iOS app -- favorite this reservoir, set a threshold, and you'll get a push the moment conditions cross.

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