2025-12-22T17:00:00-07:00
...CRITICAL FIRE WEATHER TODAY... .Near record temperatures today, combined with another period of gusty westerly winds in and near the Front Range foothills will lead to critical fire weather conditions, especially from the Boulder county foothills south into South Park and the Palmer Divide. The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 8 AM this morning to 5 PM MST this afternoon. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 239 and 241. * TIMING...From 8 AM this morning to 5 PM MST this afternoon. * WINDS...West 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 9 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
77
cfs, and is expected to yield approximately
153
acre-ft of water today; about 49%
of normal.
River levels are low and may signify a drought.
Average streamflow for this time of year is
159 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 St Helena Ca
reporting a streamflow rate of 3,260 cfs.
This is also the highest stage along the Napa River, with a gauge stage of
10.71 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.
River Details
| Last Updated | 2025-12-21 |
| Discharge Volume | 153 ACRE-FT |
| Streamflow |
77.3 cfs
-11.4 cfs (-12.85%) |
| Percent of Normal | 48.74% |
| 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 |
3260 cfs | 10.71 ft | -12.85 | |||||
|
Napa R Nr Napa Ca
USGS 11458000 |
678 cfs | 6.66 ft | 398.62 |
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.