Reservoir Report

San Gabriel reservoir

California, USA USBR
Today high
--
Tonight low
--
Current storage
448acre-ft
% of normal
-93%
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Right now · current storage
San Gabriel
USBR · SGB
448 acre-ft
As of 2026-05-11
Seasonal avg
6,190
Record max
43,262
24h change
9.0%
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San Gabriel -- None reservoir
San Gabriel None
About this reservoir

San Gabriel

San Gabriel is a city located in Los Angeles County, California. The area is rich in history as it was inhabited by Tongva Native Americans before Spanish colonizers arrived in the 1770s. The San Gabriel River runs through the city and is a vital source of water for the area. The river is fed by snowpack from the San Gabriel Mountains, which also provide water for local reservoirs. The city's main agricultural crop is citrus, while recreational activities include hiking, camping, and fishing. Additionally, the San Gabriel Mountains provide opportunities for skiing and snowboarding during winter months. The city is also home to the historic San Gabriel Mission, which was established in 1771 as part of the Spanish colonization of California.

StateNone
OperatorUSBR
Site IDSGB
Percent of normal-93%
Last updated2026-05-11
Records since2021
Storage trends

Daily levels at San Gabriel

Storage volume, pool elevation, and total release plotted from the operating agency's daily observations.

Storage

acre-ft · code 2

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 San Gabriel -- inflows here typically show up in storage 24-72 hours later.

Track San Gabriel 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 San Gabriel

Where does the data for San Gabriel 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.

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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