2026-03-05T18:00:00-07:00
* AFFECTED AREA...Fire Weather Zones 241, 246 and 247. * TIMING...From noon to 6 PM MST Thursday. * WINDS...South 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire.
Summary
Total streamflow across the
Napa River
was last observed at
277
cfs, and is expected to yield approximately
549
acre-ft of water today; about 45%
of normal.
River levels are low and may signify a drought.
Average streamflow for this time of year is
620 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 174 cfs.
This is also the highest stage along the Napa River, with a gauge stage of
4.26 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.
15-Day Weather Outlook
River Details
| Last Updated | 2026-03-04 |
| Discharge Volume | 549 ACRE-FT |
| Streamflow |
277.0 cfs
-28.0 cfs (-9.18%) |
| Percent of Normal | 44.7% |
| Maximum |
15,200.0 cfs
2025-02-05 |
| Seasonal Avg | cfs |
River Streamflow Levels
| Streamgauge | Streamflow | Gauge Stage | 24hr Change (%) | % Normal | Minimum (cfs) | Maximum (cfs) | Air Temp | Elevation |
|---|---|---|---|---|---|---|---|---|
|
Napa R Nr St Helena Ca
USGS 11456000 |
103 cfs | 2.4 ft | -9.65 | |||||
|
Napa R Nr Napa Ca
USGS 11458000 |
174 cfs | 4.26 ft | -8.9 |
Seasonal Discharge Comparison
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.