NAPA RIVER

Last Updated: April 14, 2026

Total streamflow across the Napa River was last observed at 106 cfs, and is expected to yield approximately 210 acre-ft of water today; about 56% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 190 cfs, with recent peaks last observed on 2025-02-05 when daily discharge volume was observed at 15,200 cfs.

Maximum discharge along the river is currently at the Napa R Nr Napa Ca reporting a streamflow rate of 68.2 cfs. This is also the highest stage along the Napa River, with a gauge stage of 3.36 ft at this location. This river is monitored from 2 different streamgauging stations along the Napa River, the highest being situated at an altitude of 179 ft, the Napa R Nr St Helena Ca.

Get the latest River Levels, Streamflow, and Hydrology for in River flows across 2 streamgages of the Napa River


15-Day Long Term Forecast


River Details

Last Updated 2026-04-14
Discharge Volume 210 ACRE-FT
Streamflow 105.7 cfs
Past 24 Hours: -71.5 cfs (-40.35%)
Percent of Normal 55.5%
Maximum 15,200.0 cfs
2025-02-05
Seasonal Avg cfs
       
River Streamflow Levels
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Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Napa R Nr St Helena Ca
USGS 11456000 		38 cfs 1.99 ft -45.01
Napa R Nr Napa Ca
USGS 11458000 		68 cfs 3.36 ft -37.43
Seasonal Discharge Comparison
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Maximum Streamflow Discharge
Streamflow Elevation Profile

It has a long history of flooding, and has been managed through various flood control projects. There are several reservoirs and dams along the river, including the Lake Berryessa Dam and the Monticello Dam, which form Lake Berryessa and Lake Hennessey, respectively. These reservoirs provide water for agricultural uses in the valley. The river is also a popular recreational destination for activities such as fishing, kayaking, and hiking. The river's hydrology has been impacted by human activity, including land use changes and water diversions. Restoration efforts are underway to improve the health of the river and its ecosystem.