Skip Navigation Link weather.gov  
NOAA logo - Click to go to the NOAA homepage National Weather Service NWS logo - Click to go to the NWS homepage
Advanced Hydrologic Prediction Service
Image background of Navigation bar Left Home News Organization
Bookmark and Share Navigation Bar End Cap

  

National Conditions
    Rivers
    Satellite
    Climate
    Observed Precip

Local Conditions
    Warnings
    Weather Forecast
    Radar

AHPS Documentation
    User Guide
    User Brochure

What is AHPS?
    Facts
    Our Partners

Feedback/Questions
    Provide Feedback
    Ask Questions

When flooded turn around don't drown
FloodSmart
USA.gov Official Web Portal
 
Hydrograph River at a Glance Download
Napa River near St. Helena Stage (ft)Flow (kcfs)Observed: 0.57 ft at 10:00AM May 09, 2021Observed: 0.57 ft at 10:15AM May 09, 2021Observed: 0.57 ft at 10:30AM May 09, 2021Observed: 0.58 ft at 10:45AM May 09, 2021Observed: 0.58 ft at 11:00AM May 09, 2021Observed: 0.58 ft at 11:15AM May 09, 2021Observed: 0.58 ft at 11:30AM May 09, 2021Observed: 0.58 ft at 11:45AM May 09, 2021Observed: 0.59 ft at 12:00PM May 09, 2021Observed: 0.58 ft at 12:15PM May 09, 2021Observed: 0.58 ft at 12:30PM May 09, 2021Observed: 0.58 ft at 12:45PM May 09, 2021Observed: 0.59 ft at 1:00PM May 09, 2021Observed: 0.58 ft at 1:15PM May 09, 2021Observed: 0.58 ft at 1:30PM May 09, 2021Observed: 0.59 ft at 1:45PM May 09, 2021Observed: 0.59 ft at 2:00PM May 09, 2021Observed: 0.59 ft at 2:15PM May 09, 2021Observed: 0.59 ft at 2:30PM May 09, 2021Observed: 0.59 ft at 2:45PM May 09, 2021Observed: 0.59 ft at 3:00PM May 09, 2021Observed: 0.59 ft at 3:15PM May 09, 2021Observed: 0.58 ft at 3:30PM May 09, 2021Observed: 0.58 ft at 3:45PM May 09, 2021Observed: 0.58 ft at 4:00PM May 09, 2021Observed: 0.59 ft at 4:15PM May 09, 2021Observed: 0.58 ft at 4:30PM May 09, 2021Observed: 0.59 ft at 4:45PM May 09, 2021Observed: 0.59 ft at 5:00PM May 09, 2021Observed: 0.58 ft at 5:15PM May 09, 2021Observed: 0.59 ft at 5:30PM May 09, 2021Observed: 0.58 ft at 5:45PM May 09, 2021Observed: 0.59 ft at 6:00PM May 09, 2021Observed: 0.59 ft at 6:15PM May 09, 2021Observed: 0.59 ft at 6:30PM May 09, 2021Observed: 0.58 ft at 6:45PM May 09, 2021Observed: 0.59 ft at 7:00PM May 09, 2021Observed: 0.59 ft at 7:15PM May 09, 2021Observed: 0.58 ft at 7:30PM May 09, 2021Observed: 0.59 ft at 7:45PM May 09, 2021Observed: 0.58 ft at 8:00PM May 09, 2021Observed: 0.59 ft at 8:15PM May 09, 2021Observed: 0.58 ft at 8:30PM May 09, 2021Observed: 0.58 ft at 8:45PM May 09, 2021Observed: 0.59 ft at 9:00PM May 09, 2021Observed: 0.58 ft at 9:15PM May 09, 2021Observed: 0.59 ft at 9:30PM May 09, 2021Observed: 0.59 ft at 9:45PM May 09, 2021Observed: 0.58 ft at 10:00PM May 09, 2021Observed: 0.59 ft at 10:15PM May 09, 2021Observed: 0.59 ft at 10:30PM May 09, 2021Observed: 0.58 ft at 10:45PM May 09, 2021Observed: 0.59 ft at 11:00PM May 09, 2021Observed: 0.58 ft at 11:15PM May 09, 2021Observed: 0.58 ft at 11:30PM May 09, 2021Observed: 0.59 ft at 11:45PM May 09, 2021Observed: 0.58 ft at 12:00AM May 10, 2021Observed: 0.58 ft at 12:15AM May 10, 2021Observed: 0.59 ft at 12:30AM May 10, 2021Observed: 0.58 ft at 12:45AM May 10, 2021Observed: 0.58 ft at 1:00AM May 10, 2021Observed: 0.59 ft at 1:15AM May 10, 2021Observed: 0.59 ft at 1:30AM May 10, 2021Observed: 0.58 ft at 1:45AM May 10, 2021Observed: 0.59 ft at 2:00AM May 10, 2021Observed: 0.59 ft at 2:15AM May 10, 2021Observed: 0.58 ft at 2:30AM May 10, 2021Observed: 0.59 ft at 2:45AM May 10, 2021Observed: 0.59 ft at 3:00AM May 10, 2021Observed: 0.58 ft at 3:15AM May 10, 2021Observed: 0.59 ft at 3:30AM May 10, 2021Observed: 0.58 ft at 3:45AM May 10, 2021Observed: 0.58 ft at 4:00AM May 10, 2021Observed: 0.58 ft at 4:15AM May 10, 2021Observed: 0.58 ft at 4:30AM May 10, 2021Observed: 0.57 ft at 4:45AM May 10, 2021Observed: 0.58 ft at 5:00AM May 10, 2021Observed: 0.57 ft at 5:15AM May 10, 2021Observed: 0.57 ft at 5:30AM May 10, 2021Observed: 0.58 ft at 5:45AM May 10, 2021Observed: 0.57 ft at 6:00AM May 10, 2021Observed: 0.57 ft at 6:15AM May 10, 2021Observed: 0.58 ft at 6:30AM May 10, 2021Observed: 0.58 ft at 6:45AM May 10, 2021Observed: 0.58 ft at 7:00AM May 10, 2021Observed: 0.58 ft at 7:15AM May 10, 2021Observed: 0.58 ft at 7:30AM May 10, 2021Observed: 0.58 ft at 7:45AM May 10, 2021Observed: 0.59 ft at 8:00AM May 10, 2021Observed: 0.59 ft at 8:15AM May 10, 2021Observed: 0.58 ft at 8:30AM May 10, 2021Observed: 0.59 ft at 8:45AM May 10, 2021Observed: 0.59 ft at 9:00AM May 10, 2021Observed: 0.59 ft at 9:15AM May 10, 2021Observed: 0.6 ft at 9:30AM May 10, 2021Observed: 0.59 ft at 9:45AM May 10, 2021Observed: 0.59 ft at 10:00AM May 10, 2021Observed: 0.59 ft at 10:15AM May 10, 2021Observed: 0.59 ft at 10:30AM May 10, 2021Observed: 0.6 ft at 10:45AM May 10, 2021Observed: 0.6 ft at 11:00AM May 10, 2021Observed: 0.6 ft at 11:15AM May 10, 2021Observed: 0.6 ft at 11:30AM May 10, 2021Highest Observation: 0.61 ft at 11:45AM May 10, 2021Observed: 0.6 ft at 12:00PM May 10, 2021Observed: 0.6 ft at 12:15PM May 10, 2021Observed: 0.6 ft at 12:30PM May 10, 2021Observed: 0.6 ft at 12:45PM May 10, 2021Observed: 0.6 ft at 1:00PM May 10, 2021Observed: 0.6 ft at 1:15PM May 10, 2021Observed: 0.6 ft at 1:30PM May 10, 2021Observed: 0.6 ft at 1:45PM May 10, 2021Observed: 0.6 ft at 2:00PM May 10, 2021Observed: 0.6 ft at 2:15PM May 10, 2021Observed: 0.6 ft at 2:30PM May 10, 2021Observed: 0.6 ft at 2:45PM May 10, 2021Observed: 0.6 ft at 3:00PM May 10, 2021Observed: 0.59 ft at 3:15PM May 10, 2021Observed: 0.6 ft at 3:30PM May 10, 2021Observed: 0.6 ft at 3:45PM May 10, 2021Observed: 0.6 ft at 4:00PM May 10, 2021Observed: 0.6 ft at 4:15PM May 10, 2021Observed: 0.59 ft at 4:30PM May 10, 2021Observed: 0.6 ft at 4:45PM May 10, 2021Observed: 0.6 ft at 5:00PM May 10, 2021Observed: 0.6 ft at 5:15PM May 10, 2021Observed: 0.59 ft at 5:30PM May 10, 2021Observed: 0.6 ft at 5:45PM May 10, 2021Observed: 0.6 ft at 6:00PM May 10, 2021Observed: 0.6 ft at 6:15PM May 10, 2021Observed: 0.6 ft at 6:30PM May 10, 2021Observed: 0.6 ft at 6:45PM May 10, 2021Observed: 0.6 ft at 7:00PM May 10, 2021Observed: 0.59 ft at 7:15PM May 10, 2021Observed: 0.6 ft at 7:30PM May 10, 2021Observed: 0.59 ft at 7:45PM May 10, 2021Observed: 0.6 ft at 8:00PM May 10, 2021Observed: 0.59 ft at 8:15PM May 10, 2021Observed: 0.6 ft at 8:30PM May 10, 2021Observed: 0.59 ft at 8:45PM May 10, 2021Observed: 0.59 ft at 9:00PM May 10, 2021Observed: 0.59 ft at 9:15PM May 10, 2021Observed: 0.59 ft at 9:30PM May 10, 2021Observed: 0.59 ft at 9:45PM May 10, 2021Observed: 0.59 ft at 10:00PM May 10, 2021Observed: 0.59 ft at 10:15PM May 10, 2021Observed: 0.59 ft at 10:30PM May 10, 2021Observed: 0.59 ft at 10:45PM May 10, 2021Observed: 0.59 ft at 11:00PM May 10, 2021Observed: 0.59 ft at 11:15PM May 10, 2021Observed: 0.59 ft at 11:30PM May 10, 2021Observed: 0.58 ft at 11:45PM May 10, 2021Observed: 0.59 ft at 12:00AM May 11, 2021Observed: 0.59 ft at 12:15AM May 11, 2021Observed: 0.58 ft at 12:30AM May 11, 2021Observed: 0.59 ft at 12:45AM May 11, 2021Observed: 0.59 ft at 1:00AM May 11, 2021Observed: 0.58 ft at 1:15AM May 11, 2021Observed: 0.59 ft at 1:30AM May 11, 2021Observed: 0.59 ft at 1:45AM May 11, 2021Observed: 0.59 ft at 2:00AM May 11, 2021Observed: 0.59 ft at 2:15AM May 11, 2021Observed: 0.59 ft at 2:30AM May 11, 2021Observed: 0.59 ft at 2:45AM May 11, 2021Observed: 0.59 ft at 3:00AM May 11, 2021Observed: 0.59 ft at 3:15AM May 11, 2021Observed: 0.59 ft at 3:30AM May 11, 2021Observed: 0.59 ft at 3:45AM May 11, 2021Observed: 0.59 ft at 4:00AM May 11, 2021Observed: 0.59 ft at 4:15AM May 11, 2021Observed: 0.58 ft at 4:30AM May 11, 2021Observed: 0.59 ft at 4:45AM May 11, 2021Observed: 0.58 ft at 5:00AM May 11, 2021Observed: 0.58 ft at 5:15AM May 11, 2021Observed: 0.58 ft at 5:30AM May 11, 2021Observed: 0.58 ft at 5:45AM May 11, 2021Observed: 0.58 ft at 6:00AM May 11, 2021Observed: 0.58 ft at 6:15AM May 11, 2021Observed: 0.58 ft at 6:30AM May 11, 2021Observed: 0.58 ft at 6:45AM May 11, 2021Observed: 0.58 ft at 7:00AM May 11, 2021Observed: 0.58 ft at 7:15AM May 11, 2021Observed: 0.57 ft at 7:30AM May 11, 2021Observed: 0.58 ft at 7:45AM May 11, 2021Observed: 0.58 ft at 8:00AM May 11, 2021Observed: 0.57 ft at 8:15AM May 11, 2021Observed: 0.58 ft at 8:30AM May 11, 2021Observed: 0.57 ft at 8:45AM May 11, 2021Observed: 0.57 ft at 9:00AM May 11, 2021Observed: 0.58 ft at 9:15AM May 11, 2021Observed: 0.57 ft at 9:30AM May 11, 2021Observed: 0.57 ft at 9:45AM May 11, 2021Observed: 0.57 ft at 10:00AM May 11, 2021Observed: 0.58 ft at 10:15AM May 11, 2021Observed: 0.58 ft at 10:30AM May 11, 2021Observed: 0.57 ft at 10:45AM May 11, 2021Observed: 0.57 ft at 11:00AM May 11, 2021Observed: 0.57 ft at 11:15AM May 11, 2021Observed: 0.57 ft at 11:30AM May 11, 2021Observed: 0.58 ft at 11:45AM May 11, 2021Observed: 0.58 ft at 12:00PM May 11, 2021Observed: 0.58 ft at 12:15PM May 11, 2021Observed: 0.57 ft at 12:30PM May 11, 2021Observed: 0.58 ft at 12:45PM May 11, 2021Observed: 0.58 ft at 1:00PM May 11, 2021Observed: 0.57 ft at 1:15PM May 11, 2021Observed: 0.58 ft at 1:30PM May 11, 2021Observed: 0.58 ft at 1:45PM May 11, 2021Observed: 0.57 ft at 2:00PM May 11, 2021Observed: 0.58 ft at 2:15PM May 11, 2021Observed: 0.58 ft at 2:30PM May 11, 2021Observed: 0.58 ft at 2:45PM May 11, 2021Observed: 0.58 ft at 3:00PM May 11, 2021Observed: 0.58 ft at 3:15PM May 11, 2021Observed: 0.57 ft at 3:30PM May 11, 2021Observed: 0.58 ft at 3:45PM May 11, 2021Observed: 0.58 ft at 4:00PM May 11, 2021Observed: 0.58 ft at 4:15PM May 11, 2021Observed: 0.58 ft at 4:30PM May 11, 2021Observed: 0.58 ft at 4:45PM May 11, 2021Observed: 0.58 ft at 5:00PM May 11, 2021Observed: 0.57 ft at 5:15PM May 11, 2021Observed: 0.58 ft at 5:30PM May 11, 2021Observed: 0.57 ft at 5:45PM May 11, 2021Observed: 0.58 ft at 6:00PM May 11, 2021Observed: 0.57 ft at 6:15PM May 11, 2021Observed: 0.58 ft at 6:30PM May 11, 2021Observed: 0.58 ft at 6:45PM May 11, 2021Observed: 0.58 ft at 7:00PM May 11, 2021Observed: 0.58 ft at 7:15PM May 11, 2021Observed: 0.58 ft at 7:30PM May 11, 2021Observed: 0.58 ft at 7:45PM May 11, 2021Observed: 0.58 ft at 8:00PM May 11, 2021Observed: 0.58 ft at 8:15PM May 11, 2021Observed: 0.58 ft at 8:30PM May 11, 2021Observed: 0.57 ft at 8:45PM May 11, 2021Observed: 0.58 ft at 9:00PM May 11, 2021Observed: 0.58 ft at 9:15PM May 11, 2021Observed: 0.58 ft at 9:30PM May 11, 2021Observed: 0.58 ft at 9:45PM May 11, 2021Observed: 0.58 ft at 10:00PM May 11, 2021Observed: 0.58 ft at 10:15PM May 11, 2021Observed: 0.58 ft at 10:30PM May 11, 2021Observed: 0.57 ft at 10:45PM May 11, 2021Observed: 0.58 ft at 11:00PM May 11, 2021Observed: 0.58 ft at 11:15PM May 11, 2021Observed: 0.57 ft at 11:30PM May 11, 2021Observed: 0.58 ft at 11:45PM May 11, 2021Observed: 0.58 ft at 12:00AM May 12, 2021Observed: 0.58 ft at 12:15AM May 12, 2021Observed: 0.58 ft at 12:30AM May 12, 2021Observed: 0.58 ft at 12:45AM May 12, 2021Observed: 0.58 ft at 1:00AM May 12, 2021Observed: 0.59 ft at 1:15AM May 12, 2021Observed: 0.58 ft at 1:30AM May 12, 2021Observed: 0.58 ft at 1:45AM May 12, 2021Observed: 0.59 ft at 2:00AM May 12, 2021Observed: 0.59 ft at 2:15AM May 12, 2021Observed: 0.58 ft at 2:30AM May 12, 2021Observed: 0.59 ft at 2:45AM May 12, 2021Observed: 0.59 ft at 3:00AM May 12, 2021Observed: 0.58 ft at 3:15AM May 12, 2021Observed: 0.59 ft at 3:30AM May 12, 2021Observed: 0.59 ft at 3:45AM May 12, 2021Observed: 0.58 ft at 4:00AM May 12, 2021Observed: 0.59 ft at 4:15AM May 12, 2021Observed: 0.58 ft at 4:30AM May 12, 2021Observed: 0.58 ft at 4:45AM May 12, 2021Observed: 0.59 ft at 5:00AM May 12, 2021Observed: 0.59 ft at 5:15AM May 12, 2021Observed: 0.59 ft at 5:30AM May 12, 2021Observed: 0.59 ft at 5:45AM May 12, 2021Observed: 0.59 ft at 6:00AM May 12, 2021Observed: 0.58 ft at 6:15AM May 12, 2021Observed: 0.59 ft at 6:30AM May 12, 2021Observed: 0.59 ft at 6:45AM May 12, 2021Observed: 0.59 ft at 7:00AM May 12, 2021Observed: 0.59 ft at 7:15AM May 12, 2021Observed: 0.59 ft at 7:30AM May 12, 2021Observed: 0.58 ft at 7:45AM May 12, 2021Observed: 0.59 ft at 8:00AM May 12, 2021Observed: 0.59 ft at 8:15AM May 12, 2021Observed: 0.58 ft at 8:30AM May 12, 2021Observed: 0.59 ft at 8:45AM May 12, 2021Observed: 0.58 ft at 9:00AM May 12, 2021Observed: 0.58 ft at 9:15AM May 12, 2021Observed: 0.59 ft at 9:30AM May 12, 2021Observed: 0.59 ft at 9:45AM May 12, 2021Observed: 0.58 ft at 10:00AM May 12, 2021Observed: 0.58 ft at 10:15AM May 12, 2021Observed: 0.59 ft at 10:30AM May 12, 2021Observed: 0.58 ft at 10:45AM May 12, 2021Observed: 0.58 ft at 11:00AM May 12, 2021Observed: 0.58 ft at 11:15AM May 12, 2021Observed: 0.58 ft at 11:30AM May 12, 2021Observed: 0.58 ft at 11:45AM May 12, 2021Observed: 0.58 ft at 12:00PM May 12, 2021Observed: 0.58 ft at 12:15PM May 12, 2021Observed: 0.57 ft at 12:30PM May 12, 2021Observed: 0.58 ft at 12:45PM May 12, 2021Observed: 0.58 ft at 1:00PM May 12, 2021Observed: 0.57 ft at 1:15PM May 12, 2021Observed: 0.58 ft at 1:30PM May 12, 2021Observed: 0.57 ft at 1:45PM May 12, 2021Observed: 0.57 ft at 2:00PM May 12, 2021Observed: 0.58 ft at 2:15PM May 12, 2021Observed: 0.57 ft at 2:30PM May 12, 2021Observed: 0.57 ft at 2:45PM May 12, 2021Observed: 0.57 ft at 3:00PM May 12, 2021Observed: 0.57 ft at 3:15PM May 12, 2021Observed: 0.57 ft at 3:30PM May 12, 2021Observed: 0.57 ft at 3:45PM May 12, 2021Observed: 0.57 ft at 4:00PM May 12, 2021Observed: 0.57 ft at 4:15PM May 12, 2021Observed: 0.57 ft at 4:30PM May 12, 2021Observed: 0.57 ft at 4:45PM May 12, 2021Observed: 0.57 ft at 5:00PM May 12, 2021Observed: 0.56 ft at 5:15PM May 12, 2021Observed: 0.57 ft at 5:30PM May 12, 2021Observed: 0.56 ft at 5:45PM May 12, 2021Observed: 0.57 ft at 6:00PM May 12, 2021Observed: 0.57 ft at 6:15PM May 12, 2021Observed: 0.57 ft at 6:30PM May 12, 2021Observed: 0.57 ft at 6:45PM May 12, 2021Observed: 0.56 ft at 7:00PM May 12, 2021Observed: 0.57 ft at 7:15PM May 12, 2021Observed: 0.56 ft at 7:30PM May 12, 2021Observed: 0.57 ft at 7:45PM May 12, 2021Observed: 0.56 ft at 8:00PM May 12, 2021Observed: 0.56 ft at 8:15PM May 12, 2021Observed: 0.57 ft at 8:30PM May 12, 2021Observed: 0.56 ft at 8:45PM May 12, 2021Observed: 0.56 ft at 9:00PM May 12, 2021Observed: 0.57 ft at 9:15PM May 12, 2021Observed: 0.56 ft at 9:30PM May 12, 2021Observed: 0.56 ft at 9:45PM May 12, 2021Observed: 0.57 ft at 10:00PM May 12, 2021Observed: 0.56 ft at 10:15PM May 12, 2021Observed: 0.57 ft at 10:30PM May 12, 2021Observed: 0.57 ft at 10:45PM May 12, 2021Observed: 0.57 ft at 11:00PM May 12, 2021Observed: 0.57 ft at 11:15PM May 12, 2021Observed: 0.56 ft at 11:30PM May 12, 2021Observed: 0.56 ft at 11:45PM May 12, 2021Observed: 0.56 ft at 12:00AM May 13, 2021Observed: 0.56 ft at 12:15AM May 13, 2021Observed: 0.56 ft at 12:30AM May 13, 2021Observed: 0.55 ft at 12:45AM May 13, 2021Observed: 0.56 ft at 1:00AM May 13, 2021Observed: 0.56 ft at 1:15AM May 13, 2021Observed: 0.55 ft at 1:30AM May 13, 2021Observed: 0.56 ft at 1:45AM May 13, 2021Observed: 0.56 ft at 2:00AM May 13, 2021Observed: 0.55 ft at 2:15AM May 13, 2021Observed: 0.55 ft at 2:30AM May 13, 2021Observed: 0.55 ft at 2:45AM May 13, 2021Observed: 0.55 ft at 3:00AM May 13, 2021Observed: 0.55 ft at 3:15AM May 13, 2021Observed: 0.55 ft at 3:30AM May 13, 2021Observed: 0.55 ft at 3:45AM May 13, 2021Observed: 0.55 ft at 4:00AM May 13, 2021Observed: 0.55 ft at 4:15AM May 13, 2021Observed: 0.55 ft at 4:30AM May 13, 2021Observed: 0.55 ft at 4:45AM May 13, 2021Observed: 0.55 ft at 5:00AM May 13, 2021Observed: 0.54 ft at 5:15AM May 13, 2021Observed: 0.55 ft at 5:30AM May 13, 2021Observed: 0.55 ft at 5:45AM May 13, 2021Observed: 0.54 ft at 6:00AM May 13, 2021Observed: 0.55 ft at 6:15AM May 13, 2021Observed: 0.55 ft at 6:30AM May 13, 2021Observed: 0.54 ft at 6:45AM May 13, 2021Observed: 0.55 ft at 7:00AM May 13, 2021Observed: 0.55 ft at 7:15AM May 13, 2021Observed: 0.54 ft at 7:30AM May 13, 2021Observed: 0.55 ft at 7:45AM May 13, 2021Observed: 0.54 ft at 8:00AM May 13, 2021Observed: 0.54 ft at 8:15AM May 13, 2021Observed: 0.55 ft at 8:30AM May 13, 2021Observed: 0.55 ft at 8:45AM May 13, 2021Observed: 0.54 ft at 9:00AM May 13, 2021Observed: 0.55 ft at 9:15AM May 13, 2021Observed: 0.55 ft at 9:30AM May 13, 2021Observed: 0.54 ft at 9:45AM May 13, 2021Observed: 0.54 ft at 10:00AM May 13, 2021Observed: 0.55 ft at 10:15AM May 13, 2021Observed: 0.55 ft at 10:30AM May 13, 2021Observed: 0.55 ft at 10:45AM May 13, 2021Observed: 0.55 ft at 11:00AM May 13, 2021Observed: 0.55 ft at 11:15AM May 13, 2021Observed: 0.55 ft at 11:30AM May 13, 2021Observed: 0.55 ft at 11:45AM May 13, 2021Observed: 0.55 ft at 12:00PM May 13, 2021Observed: 0.55 ft at 12:15PM May 13, 2021Observed: 0.55 ft at 12:30PM May 13, 2021Observed: 0.56 ft at 12:45PM May 13, 2021Observed: 0.56 ft at 1:00PM May 13, 2021Observed: 0.55 ft at 1:15PM May 13, 2021Observed: 0.56 ft at 1:30PM May 13, 2021Observed: 0.56 ft at 1:45PM May 13, 2021Observed: 0.56 ft at 2:00PM May 13, 2021Observed: 0.56 ft at 2:15PM May 13, 2021Observed: 0.57 ft at 2:30PM May 13, 2021Observed: 0.57 ft at 2:45PM May 13, 2021Observed: 0.56 ft at 3:00PM May 13, 2021Observed: 0.57 ft at 3:15PM May 13, 2021Observed: 0.57 ft at 3:30PM May 13, 2021Observed: 0.57 ft at 3:45PM May 13, 2021Observed: 0.57 ft at 4:00PM May 13, 2021Observed: 0.57 ft at 4:15PM May 13, 2021Observed: 0.57 ft at 4:30PM May 13, 2021Observed: 0.57 ft at 4:45PM May 13, 2021Observed: 0.58 ft at 5:00PM May 13, 2021Observed: 0.57 ft at 5:15PM May 13, 2021Observed: 0.57 ft at 5:30PM May 13, 2021Observed: 0.57 ft at 5:45PM May 13, 2021Observed: 0.57 ft at 6:00PM May 13, 2021Observed: 0.58 ft at 6:15PM May 13, 2021Observed: 0.57 ft at 6:30PM May 13, 2021Observed: 0.57 ft at 6:45PM May 13, 2021Observed: 0.57 ft at 7:00PM May 13, 2021Observed: 0.57 ft at 7:15PM May 13, 2021Observed: 0.58 ft at 7:30PM May 13, 2021Observed: 0.57 ft at 7:45PM May 13, 2021Observed: 0.57 ft at 8:00PM May 13, 2021Observed: 0.58 ft at 8:15PM May 13, 2021Observed: 0.57 ft at 8:30PM May 13, 2021Observed: 0.57 ft at 8:45PM May 13, 2021Observed: 0.58 ft at 9:00PM May 13, 2021Observed: 0.57 ft at 9:15PM May 13, 2021Observed: 0.57 ft at 9:30PM May 13, 2021Observed: 0.58 ft at 9:45PM May 13, 2021Observed: 0.57 ft at 10:00PM May 13, 2021Observed: 0.57 ft at 10:15PM May 13, 2021Observed: 0.58 ft at 10:30PM May 13, 2021Observed: 0.58 ft at 10:45PM May 13, 2021Observed: 0.57 ft at 11:00PM May 13, 2021Observed: 0.58 ft at 11:15PM May 13, 2021Observed: 0.58 ft at 11:30PM May 13, 2021Observed: 0.57 ft at 11:45PM May 13, 2021Observed: 0.58 ft at 12:00AM May 14, 2021Observed: 0.58 ft at 12:15AM May 14, 2021Observed: 0.58 ft at 12:30AM May 14, 2021Observed: 0.58 ft at 12:45AM May 14, 2021Observed: 0.58 ft at 1:00AM May 14, 2021Observed: 0.58 ft at 1:15AM May 14, 2021Observed: 0.58 ft at 1:30AM May 14, 2021Observed: 0.58 ft at 1:45AM May 14, 2021Observed: 0.57 ft at 2:00AM May 14, 2021Observed: 0.57 ft at 2:15AM May 14, 2021Observed: 0.57 ft at 2:30AM May 14, 2021Observed: 0.57 ft at 2:45AM May 14, 2021Observed: 0.57 ft at 3:00AM May 14, 2021Observed: 0.57 ft at 3:15AM May 14, 2021Observed: 0.57 ft at 3:30AM May 14, 2021Observed: 0.58 ft at 3:45AM May 14, 2021Observed: 0.58 ft at 4:00AM May 14, 2021Observed: 0.58 ft at 4:15AM May 14, 2021Observed: 0.58 ft at 4:30AM May 14, 2021Observed: 0.58 ft at 4:45AM May 14, 2021Observed: 0.58 ft at 5:00AM May 14, 2021Observed: 0.58 ft at 5:15AM May 14, 2021Observed: 0.58 ft at 5:30AM May 14, 2021Observed: 0.57 ft at 5:45AM May 14, 2021Observed: 0.58 ft at 6:00AM May 14, 2021Observed: 0.57 ft at 6:15AM May 14, 2021Observed: 0.57 ft at 6:30AM May 14, 2021Observed: 0.58 ft at 6:45AM May 14, 2021Observed: 0.57 ft at 7:00AM May 14, 2021Observed: 0.57 ft at 7:15AM May 14, 2021Observed: 0.57 ft at 7:30AM May 14, 2021Observed: 0.57 ft at 7:45AM May 14, 2021Observed: 0.58 ft at 8:00AM May 14, 2021Observed: 0.58 ft at 8:15AM May 14, 2021Observed: 0.57 ft at 8:30AM May 14, 2021Observed: 0.57 ft at 8:45AM May 14, 2021Observed: 0.58 ft at 9:00AM May 14, 2021Observed: 0.58 ft at 9:15AM May 14, 2021Observed: 0.57 ft at 9:30AM May 14, 2021Highest Forecast: 0.6 ft 10:00AM May 14, 2021Highest Forecast: 0.6 ft 11:00AM May 14, 2021Highest Forecast: 0.6 ft 12:00PM May 14, 2021Highest Forecast: 0.6 ft 1:00PM May 14, 2021Highest Forecast: 0.6 ft 2:00PM May 14, 2021Highest Forecast: 0.6 ft 3:00PM May 14, 2021Highest Forecast: 0.6 ft 4:00PM May 14, 2021Highest Forecast: 0.6 ft 5:00PM May 14, 2021Highest Forecast: 0.6 ft 6:00PM May 14, 2021Highest Forecast: 0.6 ft 7:00PM May 14, 2021Highest Forecast: 0.6 ft 8:00PM May 14, 2021Highest Forecast: 0.6 ft 9:00PM May 14, 2021Highest Forecast: 0.6 ft 10:00PM May 14, 2021Highest Forecast: 0.6 ft 11:00PM May 14, 2021Highest Forecast: 0.6 ft 12:00AM May 15, 2021Highest Forecast: 0.6 ft 1:00AM May 15, 2021Highest Forecast: 0.6 ft 2:00AM May 15, 2021Highest Forecast: 0.6 ft 3:00AM May 15, 2021Highest Forecast: 0.6 ft 4:00AM May 15, 2021Highest Forecast: 0.6 ft 5:00AM May 15, 2021Highest Forecast: 0.6 ft 6:00AM May 15, 2021Highest Forecast: 0.6 ft 7:00AM May 15, 2021Highest Forecast: 0.6 ft 8:00AM May 15, 2021Highest Forecast: 0.6 ft 9:00AM May 15, 2021Highest Forecast: 0.6 ft 10:00AM May 15, 2021Highest Forecast: 0.6 ft 11:00AM May 15, 2021Highest Forecast: 0.6 ft 12:00PM May 15, 2021Highest Forecast: 0.6 ft 1:00PM May 15, 2021Highest Forecast: 0.6 ft 2:00PM May 15, 2021Highest Forecast: 0.6 ft 3:00PM May 15, 2021Highest Forecast: 0.6 ft 4:00PM May 15, 2021Highest Forecast: 0.6 ft 5:00PM May 15, 2021Highest Forecast: 0.6 ft 6:00PM May 15, 2021Highest Forecast: 0.6 ft 7:00PM May 15, 2021Highest Forecast: 0.6 ft 8:00PM May 15, 2021Highest Forecast: 0.6 ft 9:00PM May 15, 2021Highest Forecast: 0.6 ft 10:00PM May 15, 2021Highest Forecast: 0.6 ft 11:00PM May 15, 2021Highest Forecast: 0.6 ft 12:00AM May 16, 2021Highest Forecast: 0.6 ft 1:00AM May 16, 2021Highest Forecast: 0.6 ft 2:00AM May 16, 2021Highest Forecast: 0.6 ft 3:00AM May 16, 2021Highest Forecast: 0.6 ft 4:00AM May 16, 2021Highest Forecast: 0.6 ft 5:00AM May 16, 2021Highest Forecast: 0.6 ft 6:00AM May 16, 2021Highest Forecast: 0.6 ft 7:00AM May 16, 2021Highest Forecast: 0.6 ft 8:00AM May 16, 2021Highest Forecast: 0.6 ft 9:00AM May 16, 2021Highest Forecast: 0.6 ft 10:00AM May 16, 2021Highest Forecast: 0.6 ft 11:00AM May 16, 2021Highest Forecast: 0.6 ft 12:00PM May 16, 2021Highest Forecast: 0.6 ft 1:00PM May 16, 2021Highest Forecast: 0.6 ft 2:00PM May 16, 2021Highest Forecast: 0.6 ft 3:00PM May 16, 2021Highest Forecast: 0.6 ft 4:00PM May 16, 2021Highest Forecast: 0.6 ft 5:00PM May 16, 2021Highest Forecast: 0.6 ft 6:00PM May 16, 2021Highest Forecast: 0.6 ft 7:00PM May 16, 2021Highest Forecast: 0.6 ft 8:00PM May 16, 2021Highest Forecast: 0.6 ft 9:00PM May 16, 2021Highest Forecast: 0.6 ft 10:00PM May 16, 2021Highest Forecast: 0.6 ft 11:00PM May 16, 2021Highest Forecast: 0.6 ft 12:00AM May 17, 2021Highest Forecast: 0.6 ft 1:00AM May 17, 2021Highest Forecast: 0.6 ft 2:00AM May 17, 2021Highest Forecast: 0.6 ft 3:00AM May 17, 2021Highest Forecast: 0.6 ft 4:00AM May 17, 2021Highest Forecast: 0.6 ft 5:00AM May 17, 2021Highest Forecast: 0.6 ft 6:00AM May 17, 2021Highest Forecast: 0.6 ft 7:00AM May 17, 2021Highest Forecast: 0.6 ft 8:00AM May 17, 2021Highest Forecast: 0.6 ft 9:00AM May 17, 2021Highest Forecast: 0.6 ft 10:00AM May 17, 2021Highest Forecast: 0.6 ft 11:00AM May 17, 2021Highest Forecast: 0.6 ft 12:00PM May 17, 2021Highest Forecast: 0.6 ft 1:00PM May 17, 2021Highest Forecast: 0.6 ft 2:00PM May 17, 2021Highest Forecast: 0.6 ft 3:00PM May 17, 2021Highest Forecast: 0.6 ft 4:00PM May 17, 2021Highest Forecast: 0.6 ft 5:00PM May 17, 2021Highest Forecast: 0.6 ft 6:00PM May 17, 2021Highest Forecast: 0.6 ft 7:00PM May 17, 2021Highest Forecast: 0.6 ft 8:00PM May 17, 2021Highest Forecast: 0.6 ft 9:00PM May 17, 2021Highest Forecast: 0.6 ft 10:00PM May 17, 2021Highest Forecast: 0.6 ft 11:00PM May 17, 2021Highest Forecast: 0.6 ft 12:00AM May 18, 2021Highest Forecast: 0.6 ft 1:00AM May 18, 2021Highest Forecast: 0.6 ft 2:00AM May 18, 2021Highest Forecast: 0.6 ft 3:00AM May 18, 2021Highest Forecast: 0.6 ft 4:00AM May 18, 2021Highest Forecast: 0.6 ft 5:00AM May 18, 2021Highest Forecast: 0.6 ft 6:00AM May 18, 2021Highest Forecast: 0.6 ft 7:00AM May 18, 2021Highest Forecast: 0.6 ft 8:00AM May 18, 2021Highest Forecast: 0.6 ft 9:00AM May 18, 2021Highest Forecast: 0.6 ft 10:00AM May 18, 2021Highest Forecast: 0.6 ft 11:00AM May 18, 2021Highest Forecast: 0.6 ft 12:00PM May 18, 2021Highest Forecast: 0.6 ft 1:00PM May 18, 2021Highest Forecast: 0.6 ft 2:00PM May 18, 2021Highest Forecast: 0.6 ft 3:00PM May 18, 2021Highest Forecast: 0.6 ft 4:00PM May 18, 2021Highest Forecast: 0.6 ft 5:00PM May 18, 2021Highest Forecast: 0.6 ft 6:00PM May 18, 2021Highest Forecast: 0.6 ft 7:00PM May 18, 2021Highest Forecast: 0.6 ft 8:00PM May 18, 2021Highest Forecast: 0.6 ft 9:00PM May 18, 2021Highest Forecast: 0.6 ft 10:00PM May 18, 2021Highest Forecast: 0.6 ft 11:00PM May 18, 2021Highest Forecast: 0.6 ft 12:00AM May 19, 2021Highest Forecast: 0.6 ft 1:00AM May 19, 2021Highest Forecast: 0.6 ft 2:00AM May 19, 2021Highest Forecast: 0.6 ft 3:00AM May 19, 2021Highest Forecast: 0.6 ft 4:00AM May 19, 2021Highest Forecast: 0.6 ft 5:00AM May 19, 2021USGS--Water Resources of the United StatesSHEC1(plotting HGIRG) Graph Created (9:45AM May 14, 2021)ObservedForecast (issued 7:39AM May 14)Latest observed value: 0.57 ft at 9:30 AM PDT 14-May-2021. Flood Stage is 18 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (PDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Napa River near St. Helena are issued routinely year-round.
Return to Area Map
Downstream Gauge Downstream Gauge - near Napa
Flood Categories (in feet)
Major Flood Stage: 22
Moderate Flood Stage: 20
Flood Stage: 18
Action Stage: 16
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.
Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
24 Disastrous Flooding. Widespread flooding across upper Napa Valley with travel essentially impossible. The peak water level during the flood of 12/31/2005 measured 23.6 feet.
22 Major Flood Stage. Major flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
20 Moderate Flood Stage. Moderate flooding of the lower portions of Silverado Trail along the reach. Inundation of low lying residential areas along the east river bank in the vicinity of Pope Street Bridge. Secondary and many primary roads inundated; most major cross roads inundated and unsafe to pass.
18 Minor Flood Stage. Minor flooding of low lying agricultural areas along river begins. Low lying rural residential areas immediately adjacent to the river and some secondary roads affected.
16 Monitor Stage. WFO Monterey may issue a Flood Watch-based products to cover Napa Valley regional flood potential at this stage.
About This Location Collapse

Latitude: 38.511389° N, Longitude: 122.454722° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 18 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 193.21 ft 209.71 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
San Francisco Bay Area Weather Forecast Office
21 Grace Hopper Ave, Stop 5
Monterey, CA 93943-5505
(831) 656-1725
Ask Questions/Webmaster
Page last modified: 2-Nov-2020 7:27 PM 		Disclaimer
Credits
Glossary 		Privacy Policy
About Us
Career Opportunities