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Hydrograph River at a Glance Download
Willow Brook at Old Redwood Highway Bridge Stage (ft)Highest Observation: 32.29 ft at 9:51AM Apr 20, 2024Observed: 32.27 ft at 10:50AM Apr 20, 2024Highest Observation: 32.29 ft at 11:48AM Apr 20, 2024Highest Observation: 32.29 ft at 12:46PM Apr 20, 2024Highest Observation: 32.29 ft at 1:45PM Apr 20, 2024Highest Observation: 32.29 ft at 2:43PM Apr 20, 2024Highest Observation: 32.29 ft at 3:41PM Apr 20, 2024Highest Observation: 32.29 ft at 4:40PM Apr 20, 2024Highest Observation: 32.29 ft at 5:38PM Apr 20, 2024Observed: 32.27 ft at 6:36PM Apr 20, 2024Observed: 32.27 ft at 7:35PM Apr 20, 2024Observed: 32.27 ft at 8:33PM Apr 20, 2024Observed: 32.27 ft at 9:31PM Apr 20, 2024Observed: 32.27 ft at 12:26AM Apr 21, 2024Observed: 32.27 ft at 1:25AM Apr 21, 2024Observed: 32.27 ft at 2:23AM Apr 21, 2024Observed: 32.27 ft at 3:21AM Apr 21, 2024Observed: 32.24 ft at 4:20AM Apr 21, 2024Observed: 32.27 ft at 5:18AM Apr 21, 2024Observed: 32.27 ft at 6:16AM Apr 21, 2024Highest Observation: 32.29 ft at 7:15AM Apr 21, 2024Observed: 32.27 ft at 8:13AM Apr 21, 2024Observed: 32.27 ft at 9:11AM Apr 21, 2024Observed: 32.24 ft at 10:10AM Apr 21, 2024Observed: 32.27 ft at 11:08AM Apr 21, 2024Observed: 32.27 ft at 12:06PM Apr 21, 2024Observed: 32.27 ft at 1:05PM Apr 21, 2024Observed: 32.27 ft at 2:03PM Apr 21, 2024Observed: 32.27 ft at 3:01PM Apr 21, 2024Observed: 32.27 ft at 4:00PM Apr 21, 2024Observed: 32.24 ft at 4:58PM Apr 21, 2024Observed: 32.24 ft at 5:56PM Apr 21, 2024Observed: 32.27 ft at 6:55PM Apr 21, 2024Observed: 32.27 ft at 8:51PM Apr 21, 2024Observed: 32.27 ft at 9:50PM Apr 21, 2024Observed: 32.27 ft at 10:48PM Apr 21, 2024Observed: 32.27 ft at 11:46PM Apr 21, 2024Observed: 32.27 ft at 12:45AM Apr 22, 2024Observed: 32.27 ft at 1:43AM Apr 22, 2024Observed: 32.24 ft at 2:41AM Apr 22, 2024Observed: 32.27 ft at 3:40AM Apr 22, 2024Observed: 32.27 ft at 4:38AM Apr 22, 2024Highest Observation: 32.29 ft at 5:36AM Apr 22, 2024Observed: 32.27 ft at 6:35AM Apr 22, 2024Observed: 32.27 ft at 7:33AM Apr 22, 2024Observed: 32.24 ft at 8:31AM Apr 22, 2024Observed: 32.27 ft at 9:30AM Apr 22, 2024Observed: 32.27 ft at 11:26AM Apr 22, 2024Observed: 32.27 ft at 12:25PM Apr 22, 2024Observed: 32.27 ft at 1:23PM Apr 22, 2024Observed: 32.27 ft at 2:21PM Apr 22, 2024Highest Observation: 32.29 ft at 3:20PM Apr 22, 2024Observed: 32.27 ft at 4:18PM Apr 22, 2024Observed: 32.24 ft at 6:15PM Apr 22, 2024Observed: 32.27 ft at 8:11PM Apr 22, 2024Observed: 32.24 ft at 9:10PM Apr 22, 2024Observed: 32.27 ft at 10:08PM Apr 22, 2024Observed: 32.24 ft at 11:06PM Apr 22, 2024Observed: 32.24 ft at 12:05AM Apr 23, 2024Observed: 32.27 ft at 1:03AM Apr 23, 2024Observed: 32.24 ft at 2:01AM Apr 23, 2024Observed: 32.24 ft at 3:00AM Apr 23, 2024Observed: 32.24 ft at 3:58AM Apr 23, 2024Observed: 32.24 ft at 4:56AM Apr 23, 2024Observed: 32.27 ft at 5:55AM Apr 23, 2024Observed: 32.24 ft at 6:53AM Apr 23, 2024Observed: 32.24 ft at 7:51AM Apr 23, 2024Observed: 32.24 ft at 8:50AM Apr 23, 2024Observed: 32.24 ft at 9:48AM Apr 23, 2024Observed: 32.24 ft at 10:46AM Apr 23, 2024Observed: 32.24 ft at 11:45AM Apr 23, 2024Observed: 32.24 ft at 12:43PM Apr 23, 2024Observed: 32.27 ft at 1:41PM Apr 23, 2024Observed: 32.24 ft at 2:40PM Apr 23, 2024Observed: 32.27 ft at 3:38PM Apr 23, 2024Observed: 32.24 ft at 4:36PM Apr 23, 2024Observed: 32.27 ft at 5:35PM Apr 23, 2024Observed: 32.24 ft at 6:33PM Apr 23, 2024Observed: 32.24 ft at 7:31PM Apr 23, 2024Observed: 32.24 ft at 8:30PM Apr 23, 2024Observed: 32.24 ft at 9:28PM Apr 23, 2024Observed: 32.24 ft at 10:26PM Apr 23, 2024Observed: 32.27 ft at 11:25PM Apr 23, 2024Observed: 32.24 ft at 1:21AM Apr 24, 2024Observed: 32.24 ft at 2:20AM Apr 24, 2024Observed: 32.24 ft at 3:18AM Apr 24, 2024Observed: 32.24 ft at 4:16AM Apr 24, 2024Observed: 32.27 ft at 5:15AM Apr 24, 2024Highest Observation: 32.29 ft at 6:13AM Apr 24, 2024Observed: 32.24 ft at 7:11AM Apr 24, 2024Observed: 32.27 ft at 9:08AM Apr 24, 2024Observed: 32.27 ft at 10:06AM Apr 24, 2024Observed: 32.24 ft at 11:05AM Apr 24, 2024Observed: 32.27 ft at 12:03PM Apr 24, 2024Observed: 32.24 ft at 2:00PM Apr 24, 2024Observed: 32.24 ft at 2:58PM Apr 24, 2024Observed: 32.24 ft at 3:56PM Apr 24, 2024Observed: 32.27 ft at 4:55PM Apr 24, 2024Observed: 32.24 ft at 5:53PM Apr 24, 2024Observed: 32.24 ft at 6:51PM Apr 24, 2024Observed: 32.24 ft at 7:50PM Apr 24, 2024Observed: 32.27 ft at 9:46PM Apr 24, 2024Observed: 32.24 ft at 10:45PM Apr 24, 2024Observed: 32.27 ft at 11:43PM Apr 24, 2024Observed: 32.27 ft at 12:41AM Apr 25, 2024Observed: 32.27 ft at 1:40AM Apr 25, 2024Observed: 32.27 ft at 2:38AM Apr 25, 2024Observed: 32.27 ft at 3:36AM Apr 25, 2024Observed: 32.24 ft at 5:33AM Apr 25, 2024PTMC1(plotting HGIRR) Graph Created (9:45AM Apr 25, 2024)ObservedLatest observed value: 32.24 ft at 5:33 AM PDT 25-Apr-2024. Flood Stage is 40.7 ft
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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.
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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
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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  
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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.
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