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AMERICAN RIVER - FOLSOM LAKE (FOLC1)
Latitude:
38.71º N
Longitude:
121.16º W
Elevation:
350 Feet
Location: Sacramento County in CA
River Group: Lower Sacramento
Issuance Time: Jun 06 2025 at 7:43 AM PDT
Please Note:Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.

Flow data on this product are unregulated / full natural flow.
Monthly Probability Plot
Monthly Streamflow Volume (1000s of Acre-Feet)
Data Updated: Jun 06 2025 at 7:48 AM PDT
ProbJun*JulAugSepOctNov
10%120.025.19.918.395.2207.4
25%113.321.48.913.827.997.0
50%109.220.37.910.918.437.8
75%106.819.57.59.915.021.9
90%104.919.37.39.612.219.0
Mean229.258.211.513.531.790.1
%Mean47.634.968.780.758.042.0
ProbDecJanFebMarAprMay
10%852.0909.1824.0928.6697.3874.3
25%304.0416.5488.5600.4549.0661.2
50%111.3185.8221.2383.0391.9394.8
75%42.771.2103.1255.0326.3240.2
90%24.342.275.2150.1234.8148.9
Mean238.7328.5372.2464.6449.2438.3
%Mean46.656.659.482.487.290.1
Note 1: %Mean is the "Median forecast monthly value (50%)" divided by the "monthly mean" (displayed as a %)
Note 2: For current month, graphic represents remaining forecast only, text represents observed + remaining forecast.

Location Photographs

ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ017)
Today: Sunny. Highs 88 to 96. South winds up to 10 mph with gusts to around 20 mph.

Tonight: Clear. Lows 55 to 64. South winds up to 10 mph with gusts to around 20 mph.

Saturday: Sunny. Highs 89 to 99. Southwest winds up to 10 mph. Gusts up to 25 mph in the afternoon.

Saturday Night: Mostly clear. Lows 54 to 64. Southwest winds 10 to 15 mph with gusts to around 25 mph.

Sunday: Mostly sunny. Highs 87 to 97. South winds up to 10 mph with gusts to around 20 mph.

Sunday Night: Mostly clear. Lows 55 to 65.

Monday: Sunny. Highs 90 to 98.

Monday Night through Thursday: Clear. Lows 53 to 63. Highs 87 to 97.