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Hydrograph River at a Glance Download
Willow Brook at Old Redwood Highway Bridge Stage (ft)Observed: 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, 2024Observed: 32.24 ft at 7:30AM Apr 25, 2024Observed: 32.27 ft at 8:28AM Apr 25, 2024Observed: 32.27 ft at 9:26AM Apr 25, 2024Observed: 32.24 ft at 10:25AM Apr 25, 2024Observed: 32.24 ft at 11:23AM Apr 25, 2024Observed: 32.24 ft at 12:21PM Apr 25, 2024Observed: 32.27 ft at 1:20PM Apr 25, 2024Observed: 32.27 ft at 2:18PM Apr 25, 2024Observed: 32.27 ft at 3:16PM Apr 25, 2024Observed: 32.27 ft at 4:15PM Apr 25, 2024Observed: 32.24 ft at 5:13PM Apr 25, 2024Observed: 32.24 ft at 6:11PM Apr 25, 2024Observed: 32.24 ft at 7:10PM Apr 25, 2024Observed: 32.27 ft at 8:08PM Apr 25, 2024Observed: 32.27 ft at 9:06PM Apr 25, 2024Observed: 32.24 ft at 10:05PM Apr 25, 2024Observed: 32.27 ft at 12:01AM Apr 26, 2024Observed: 32.27 ft at 1:00AM Apr 26, 2024Observed: 32.27 ft at 1:58AM Apr 26, 2024Observed: 32.29 ft at 2:56AM Apr 26, 2024Observed: 32.27 ft at 4:53AM Apr 26, 2024Observed: 32.27 ft at 5:51AM Apr 26, 2024Observed: 32.27 ft at 6:50AM Apr 26, 2024Observed: 32.27 ft at 7:48AM Apr 26, 2024Observed: 32.27 ft at 9:45AM Apr 26, 2024Observed: 32.27 ft at 10:43AM Apr 26, 2024Observed: 32.27 ft at 11:41AM Apr 26, 2024Observed: 32.27 ft at 12:40PM Apr 26, 2024Observed: 32.24 ft at 1:38PM Apr 26, 2024Highest Observation: 32.32 ft at 2:36PM Apr 26, 2024Observed: 32.24 ft at 3:35PM Apr 26, 2024Observed: 32.24 ft at 5:31PM Apr 26, 2024Observed: 32.24 ft at 6:30PM Apr 26, 2024Observed: 32.24 ft at 7:28PM Apr 26, 2024Observed: 32.24 ft at 8:26PM Apr 26, 2024Observed: 32.24 ft at 10:23PM Apr 26, 2024Observed: 32.24 ft at 11:21PM Apr 26, 2024Observed: 32.27 ft at 12:20AM Apr 27, 2024Observed: 32.27 ft at 1:18AM Apr 27, 2024Observed: 32.27 ft at 2:16AM Apr 27, 2024Observed: 32.27 ft at 3:15AM Apr 27, 2024Observed: 32.24 ft at 4:13AM Apr 27, 2024Observed: 32.27 ft at 5:11AM Apr 27, 2024Observed: 32.27 ft at 6:10AM Apr 27, 2024Observed: 32.24 ft at 7:08AM Apr 27, 2024Observed: 32.27 ft at 8:06AM Apr 27, 2024Observed: 32.24 ft at 9:05AM Apr 27, 2024Observed: 32.27 ft at 10:03AM Apr 27, 2024Observed: 32.24 ft at 11:01AM Apr 27, 2024Observed: 32.27 ft at 12:58PM Apr 27, 2024Observed: 32.29 ft at 1:56PM Apr 27, 2024Observed: 32.24 ft at 2:55PM Apr 27, 2024Observed: 32.24 ft at 3:53PM Apr 27, 2024Observed: 32.24 ft at 4:51PM Apr 27, 2024Observed: 32.27 ft at 5:50PM Apr 27, 2024Observed: 32.24 ft at 6:48PM Apr 27, 2024Observed: 32.24 ft at 7:46PM Apr 27, 2024Observed: 32.24 ft at 8:45PM Apr 27, 2024Observed: 32.24 ft at 9:43PM Apr 27, 2024Observed: 32.27 ft at 10:41PM Apr 27, 2024Observed: 32.24 ft at 11:40PM Apr 27, 2024Observed: 32.24 ft at 12:38AM Apr 28, 2024Observed: 32.24 ft at 1:36AM Apr 28, 2024Observed: 32.24 ft at 2:35AM Apr 28, 2024Observed: 32.24 ft at 3:33AM Apr 28, 2024Observed: 32.24 ft at 4:31AM Apr 28, 2024Observed: 32.24 ft at 5:30AM Apr 28, 2024Observed: 32.24 ft at 6:28AM Apr 28, 2024Observed: 32.24 ft at 7:26AM Apr 28, 2024Observed: 32.24 ft at 8:25AM Apr 28, 2024Observed: 32.24 ft at 9:23AM Apr 28, 2024Observed: 32.24 ft at 10:21AM Apr 28, 2024Observed: 32.27 ft at 11:20AM Apr 28, 2024Observed: 32.24 ft at 12:18PM Apr 28, 2024Observed: 32.24 ft at 1:16PM Apr 28, 2024Observed: 32.24 ft at 2:15PM Apr 28, 2024Observed: 32.24 ft at 3:13PM Apr 28, 2024Observed: 32.24 ft at 4:11PM Apr 28, 2024Observed: 32.24 ft at 5:10PM Apr 28, 2024Observed: 32.24 ft at 6:08PM Apr 28, 2024Observed: 32.24 ft at 7:06PM Apr 28, 2024Observed: 32.27 ft at 8:05PM Apr 28, 2024Observed: 32.24 ft at 9:03PM Apr 28, 2024Observed: 32.24 ft at 10:01PM Apr 28, 2024Observed: 32.24 ft at 11:00PM Apr 28, 2024Observed: 32.24 ft at 12:56AM Apr 29, 2024Observed: 32.24 ft at 1:55AM Apr 29, 2024Observed: 32.24 ft at 3:51AM Apr 29, 2024Observed: 32.24 ft at 4:50AM Apr 29, 2024Observed: 32.24 ft at 5:48AM Apr 29, 2024Observed: 32.24 ft at 6:46AM Apr 29, 2024PTMC1(plotting HGIRR) Graph Created (11:00AM Apr 29, 2024)ObservedLatest observed value: 32.24 ft at 6:46 AM PDT 29-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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