Please Note: 1) Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.
2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.
Disastrous flooding. Widespread flooding occurs in the entire Napa Valley, with transportation impossible. Disastrous damage to homes and businesses in the Napa Valley, especially in the City of Napa.
30.0 Feet
In the City of Napa, flooding in the south oxbow area expands south towards Tulocay Creek and Imola Avenue begins to flood on both sides of the river. Major flooding continues in the Napa Valley, with major damage to homes and businesses, especially in Napa. Transportation impossible in the Napa Valley. 20,000 acres possibly flooded in the Napa Valley. Between 5,000 and 7,000 evacuations occurred in the 2/18/86 record flood, 37,000 cfs, 30.20 feet.
29.0 Feet
In the City of Napa, the Soscol corridor between the bypass and Lakepark in inundated, and the Lakepark area begins to flood and flow begins to leave the Napa River at Riverside Drive.
28.0 Feet
Major flooding. In the City of Napa, significant flooding occurs near Lincoln Avenue with some secondary roads inundated. Major flooding of towns within the reach of the gage, especially in Napa. Inundation of agricultural land and major damage from bank erosion and sediment deposition in Napa Valley. Transportation difficult throughout the Napa Valley. The 1/1/1997 flood measured 28.07 feet and cut off east-west travel except at Highway 29 over the Napa River.
27.0 Feet
In the City of Napa, moderate flooding begins on the east side of Napa River near Milliken Creek Inn.
26.0 Feet
Moderate flooding. In the City of Napa, flow begins to leave the Napa River channel in the South Coombs area (north of Imola Avenue) and the south oxbow (near Taylor Street). Crop losses and erosion damage become serious. Moderate flood damage in lower parts of urban areas along the reach. Transportation in the Napa Valley becoming difficult. The flood of 2/3/1998 measured 26.72 feet.
25.0 Feet
Flood Stage. Flooding of lowest parts of towns in reach begins. Inundation of lowest agricultural land in Napa Valley. Some secondary roads are inundated. Moderate damage from bank erosion and sediment deposition throughout the reach.
24.0 Feet
In the City of Napa, flow begins to leave the Napa River channel at Riverpointe (north of Lincoln Avenue).
22.0 Feet
Monitor Stage. In the City of Napa, the Napa River Dry Bypass is fully inundated and flow begins to cross McKinstry Street.
20.0 Feet
Erosion of lowest agricultural areas along river begins.
Official 7 Day National Weather Service Forecast (CAZ506)
Today: Showers and a slight chance of thunderstorms in the morning, then a chance of showers in the afternoon. Highs in the 40s to upper 50s. South winds 10 to 15 mph.
Tonight: A chance of showers in the evening, then showers after midnight. Lows in the 40s to lower 50s. Southwest winds 5 to 10 mph and becoming southeast 10 to 20 mph after midnight.
Monday: Showers. Highs in the upper 40s to mid 50s. Southeast winds 10 to 20 mph.
Monday Night: Showers likely in the evening, then a slight chance of showers after midnight. Patchy fog after midnight. Lows in the 40s. East winds 5 to 10 mph. Chance of showers 60 percent.
Tuesday: Mostly cloudy. Patchy dense fog in the morning. A slight chance of showers. Highs in the upper 40s to mid 50s. Northeast winds around 5 mph. Chance of showers 20 percent.
Tuesday Night: Mostly cloudy. Patchy fog. A slight chance of showers. Lows in the 40s.
Wednesday: Mostly cloudy. Patchy fog. A chance of showers. Highs in the 50s.
Wednesday Night: Partly cloudy. A slight chance of showers. Lows in the upper 30s to mid 40s.
Thursday: Partly cloudy in the morning then becoming sunny. Highs in the upper 40s to mid 50s.
Thursday Night: Mostly clear in the evening then becoming partly cloudy. Patchy frost. Lows in the mid 30s to lower 40s.
Friday: Partly cloudy in the morning then becoming sunny. Highs in the 40s to upper 50s.
Friday Night: Mostly clear. Areas of frost. Lows in the mid 30s to lower 40s.
Saturday: Sunny. Highs in the upper 40s to lower 60s.
Product Disclaimer
This river graphic is not intended to serve as a
substitute for official flood watches, warnings, advisories, or statements
issued by the NWS San Francisco Bay Area-Monterey Weather Forecast Office. Observations
are preliminary and subject to change. River levels identified as "forecast"
should be consistent with those contained in official NWS products.
River levels identified as "guidance" have significant uncertainty
due to future weather or reservoir regulation and are provided for planning
purposes only.
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