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
Bookmark and Share Navigation Bar End Cap

  
 
Hydrograph River at a Glance Download
Willow Brook at Old Redwood Highway Bridge Stage (ft)Observed: 23.32 ft at 10:00PM Oct 13, 2019Observed: 23.35 ft at 11:00PM Oct 13, 2019Observed: 23.35 ft at 12:00AM Oct 14, 2019Observed: 23.35 ft at 1:00AM Oct 14, 2019Observed: 23.35 ft at 2:00AM Oct 14, 2019Observed: 23.35 ft at 3:00AM Oct 14, 2019Observed: 23.37 ft at 4:00AM Oct 14, 2019Observed: 23.32 ft at 5:00AM Oct 14, 2019Observed: 23.35 ft at 6:00AM Oct 14, 2019Observed: 23.35 ft at 7:00AM Oct 14, 2019Observed: 23.37 ft at 8:00AM Oct 14, 2019Observed: 23.35 ft at 9:00AM Oct 14, 2019Observed: 23.35 ft at 10:00AM Oct 14, 2019Observed: 23.35 ft at 11:00AM Oct 14, 2019Observed: 23.35 ft at 12:00PM Oct 14, 2019Observed: 23.37 ft at 1:00PM Oct 14, 2019Observed: 23.4 ft at 2:00PM Oct 14, 2019Observed: 23.4 ft at 3:00PM Oct 14, 2019Observed: 23.4 ft at 4:00PM Oct 14, 2019Observed: 23.4 ft at 5:00PM Oct 14, 2019Observed: 23.35 ft at 6:00PM Oct 14, 2019Observed: 23.35 ft at 7:00PM Oct 14, 2019Observed: 23.35 ft at 8:00PM Oct 14, 2019Observed: 23.35 ft at 9:00PM Oct 14, 2019Observed: 23.35 ft at 10:00PM Oct 14, 2019Observed: 23.35 ft at 11:00PM Oct 14, 2019Observed: 23.37 ft at 12:00AM Oct 15, 2019Observed: 23.35 ft at 1:00AM Oct 15, 2019Observed: 23.35 ft at 2:00AM Oct 15, 2019Observed: 23.35 ft at 3:00AM Oct 15, 2019Observed: 23.35 ft at 4:00AM Oct 15, 2019Observed: 23.32 ft at 5:00AM Oct 15, 2019Observed: 23.35 ft at 6:00AM Oct 15, 2019Observed: 23.35 ft at 7:00AM Oct 15, 2019Observed: 23.35 ft at 8:00AM Oct 15, 2019Observed: 23.35 ft at 9:00AM Oct 15, 2019Observed: 23.35 ft at 10:00AM Oct 15, 2019Observed: 23.35 ft at 11:00AM Oct 15, 2019Observed: 23.35 ft at 12:00PM Oct 15, 2019Observed: 23.37 ft at 1:00PM Oct 15, 2019Observed: 23.4 ft at 2:00PM Oct 15, 2019Observed: 23.4 ft at 3:00PM Oct 15, 2019Observed: 23.4 ft at 4:00PM Oct 15, 2019Observed: 23.37 ft at 5:00PM Oct 15, 2019Observed: 23.35 ft at 6:00PM Oct 15, 2019Observed: 23.35 ft at 7:00PM Oct 15, 2019Observed: 23.35 ft at 8:00PM Oct 15, 2019Observed: 23.37 ft at 9:00PM Oct 15, 2019Observed: 23.4 ft at 10:00PM Oct 15, 2019Observed: 23.37 ft at 11:00PM Oct 15, 2019Observed: 23.35 ft at 12:00AM Oct 16, 2019Observed: 23.35 ft at 1:00AM Oct 16, 2019Observed: 23.35 ft at 2:00AM Oct 16, 2019Observed: 23.35 ft at 3:00AM Oct 16, 2019Observed: 23.32 ft at 4:00AM Oct 16, 2019Observed: 23.35 ft at 5:00AM Oct 16, 2019Observed: 23.35 ft at 6:00AM Oct 16, 2019Observed: 23.35 ft at 7:00AM Oct 16, 2019Observed: 23.35 ft at 8:00AM Oct 16, 2019Observed: 23.35 ft at 9:00AM Oct 16, 2019Observed: 23.37 ft at 10:00AM Oct 16, 2019Observed: 23.37 ft at 11:00AM Oct 16, 2019Observed: 23.37 ft at 12:00PM Oct 16, 2019Observed: 23.37 ft at 1:00PM Oct 16, 2019Observed: 23.4 ft at 2:00PM Oct 16, 2019Observed: 23.37 ft at 3:00PM Oct 16, 2019Observed: 23.37 ft at 4:00PM Oct 16, 2019Observed: 23.4 ft at 5:00PM Oct 16, 2019Observed: 23.37 ft at 6:00PM Oct 16, 2019Observed: 23.35 ft at 7:00PM Oct 16, 2019Observed: 23.35 ft at 8:00PM Oct 16, 2019Observed: 23.37 ft at 9:00PM Oct 16, 2019Observed: 23.35 ft at 10:00PM Oct 16, 2019Observed: 23.35 ft at 11:00PM Oct 16, 2019Observed: 23.35 ft at 12:00AM Oct 17, 2019Observed: 23.35 ft at 1:00AM Oct 17, 2019Observed: 23.35 ft at 2:00AM Oct 17, 2019Observed: 23.35 ft at 3:00AM Oct 17, 2019Observed: 23.35 ft at 4:00AM Oct 17, 2019Observed: 23.37 ft at 5:00AM Oct 17, 2019Observed: 23.35 ft at 6:00AM Oct 17, 2019Observed: 23.35 ft at 7:00AM Oct 17, 2019Observed: 23.4 ft at 8:00AM Oct 17, 2019Observed: 23.35 ft at 9:00AM Oct 17, 2019Observed: 23.37 ft at 10:00AM Oct 17, 2019Observed: 23.35 ft at 11:00AM Oct 17, 2019Observed: 23.37 ft at 12:00PM Oct 17, 2019Highest Observation: 23.42 ft at 1:00PM Oct 17, 2019Observed: 23.4 ft at 2:00PM Oct 17, 2019Observed: 23.4 ft at 3:00PM Oct 17, 2019Observed: 23.37 ft at 4:00PM Oct 17, 2019Observed: 23.37 ft at 5:00PM Oct 17, 2019Observed: 23.37 ft at 6:00PM Oct 17, 2019Observed: 23.37 ft at 7:00PM Oct 17, 2019Observed: 23.35 ft at 8:00PM Oct 17, 2019Observed: 23.35 ft at 9:00PM Oct 17, 2019Observed: 23.35 ft at 10:00PM Oct 17, 2019Observed: 23.35 ft at 11:00PM Oct 17, 2019Observed: 23.35 ft at 12:00AM Oct 18, 2019Observed: 23.37 ft at 1:00AM Oct 18, 2019Observed: 23.35 ft at 2:00AM Oct 18, 2019Observed: 23.35 ft at 3:00AM Oct 18, 2019Observed: 23.35 ft at 4:00AM Oct 18, 2019Observed: 23.32 ft at 5:00AM Oct 18, 2019Observed: 23.35 ft at 6:00AM Oct 18, 2019Observed: 23.37 ft at 7:00AM Oct 18, 2019Observed: 23.37 ft at 8:00AM Oct 18, 2019Observed: 23.35 ft at 9:00AM Oct 18, 2019Observed: 23.35 ft at 10:00AM Oct 18, 2019Observed: 23.35 ft at 11:00AM Oct 18, 2019Observed: 23.4 ft at 12:00PM Oct 18, 2019Observed: 23.35 ft at 1:00PM Oct 18, 2019Observed: 23.4 ft at 2:00PM Oct 18, 2019Observed: 23.4 ft at 3:00PM Oct 18, 2019Observed: 23.4 ft at 4:00PM Oct 18, 2019Observed: 23.37 ft at 5:00PM Oct 18, 2019Observed: 23.35 ft at 6:00PM Oct 18, 2019Observed: 23.35 ft at 7:00PM Oct 18, 2019Observed: 23.35 ft at 8:00PM Oct 18, 2019PTMC1(plotting HGIRR) Graph Created (9:00PM Oct 18, 2019)ObservedLatest observed value: 23.35 ft at 8:00 PM PDT 18-Oct-2019. Flood Stage is 40.7 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (PDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Graphical forecasts are not available for the Willow Brook at Old Redwood Highway Bridge. During times of high water, forecast crest information can be found in the text products.
Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 44.3
Moderate Flood Stage: 43
Flood Stage: 40.7
Action Stage: 40.7
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.
Zoom Level:14
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
44.3 Major Flood Stage. Water level has reached by bottom of the bridge soffit.
43.9 Flood waters flowing down Redwood Way at Old Redwood Highway.
43.2 Water levels are above bankfull and begin flowing through upstream businesses, including passing through the old lumber company's parking lot.
43 Moderate Flood Stage. A local detention basin may begin to release water onto North McDowell Blvd. Ext.
42.3 Water begins to flow across Ely Road at the railroad track near Old Redwood Highway. Holm Road begins to flood and water ponds on North McDowell at the Post Office.
41.7 City of Petaluma will notify the City Manager and evaluate the need to activate the Emergency Operations Center.
40.7 Action Stage. NWS and City of Petaluma will be closely monitoring the situation. NWS will issue an urban/small stream advisory if not already issued.
About This Location Collapse

Latitude: 38.279722° N, Longitude: 122.669444° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 40.7 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 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  
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: 1-Mar-2019 12:32 AM
Disclaimer
Credits
Glossary
Privacy Policy
About Us
Career Opportunities