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Hydrograph River at a Glance Download
Willow Brook at Old Redwood Highway Bridge Stage (ft)Observed: 32.27 ft at 5:10AM Apr 11, 2024Observed: 32.27 ft at 6:08AM Apr 11, 2024Observed: 32.29 ft at 7:06AM Apr 11, 2024Observed: 32.27 ft at 8:05AM Apr 11, 2024Observed: 32.27 ft at 9:03AM Apr 11, 2024Observed: 32.27 ft at 10:01AM Apr 11, 2024Observed: 32.29 ft at 11:00AM Apr 11, 2024Observed: 32.27 ft at 11:58AM Apr 11, 2024Observed: 32.32 ft at 12:56PM Apr 11, 2024Observed: 32.29 ft at 1:55PM Apr 11, 2024Observed: 32.29 ft at 2:53PM Apr 11, 2024Observed: 32.29 ft at 3:51PM Apr 11, 2024Observed: 32.29 ft at 4:50PM Apr 11, 2024Observed: 32.29 ft at 5:48PM Apr 11, 2024Observed: 32.29 ft at 6:46PM Apr 11, 2024Observed: 32.29 ft at 7:45PM Apr 11, 2024Observed: 32.27 ft at 8:43PM Apr 11, 2024Observed: 32.29 ft at 9:41PM Apr 11, 2024Observed: 32.27 ft at 10:40PM Apr 11, 2024Observed: 32.29 ft at 11:38PM Apr 11, 2024Observed: 32.29 ft at 12:36AM Apr 12, 2024Observed: 32.29 ft at 1:35AM Apr 12, 2024Observed: 32.29 ft at 2:33AM Apr 12, 2024Observed: 32.29 ft at 3:31AM Apr 12, 2024Observed: 32.27 ft at 4:30AM Apr 12, 2024Observed: 32.29 ft at 5:28AM Apr 12, 2024Observed: 32.29 ft at 6:26AM Apr 12, 2024Observed: 32.29 ft at 7:25AM Apr 12, 2024Observed: 32.29 ft at 8:23AM Apr 12, 2024Observed: 32.29 ft at 10:20AM Apr 12, 2024Observed: 32.29 ft at 11:18AM Apr 12, 2024Observed: 32.29 ft at 12:16PM Apr 12, 2024Observed: 32.29 ft at 1:15PM Apr 12, 2024Observed: 32.32 ft at 2:13PM Apr 12, 2024Observed: 32.29 ft at 3:11PM Apr 12, 2024Observed: 32.27 ft at 4:10PM Apr 12, 2024Observed: 32.27 ft at 5:08PM Apr 12, 2024Observed: 32.29 ft at 6:06PM Apr 12, 2024Observed: 32.29 ft at 7:05PM Apr 12, 2024Observed: 32.27 ft at 8:03PM Apr 12, 2024Observed: 32.29 ft at 9:01PM Apr 12, 2024Observed: 32.29 ft at 10:00PM Apr 12, 2024Observed: 32.29 ft at 10:58PM Apr 12, 2024Observed: 32.32 ft at 11:56PM Apr 12, 2024Observed: 32.37 ft at 1:53AM Apr 13, 2024Observed: 32.44 ft at 2:51AM Apr 13, 2024Observed: 32.54 ft at 3:50AM Apr 13, 2024Observed: 32.57 ft at 4:48AM Apr 13, 2024Observed: 32.57 ft at 5:46AM Apr 13, 2024Observed: 32.57 ft at 6:45AM Apr 13, 2024Observed: 32.54 ft at 7:43AM Apr 13, 2024Observed: 32.59 ft at 8:41AM Apr 13, 2024Observed: 32.64 ft at 9:40AM Apr 13, 2024Highest Observation: 32.69 ft at 10:38AM Apr 13, 2024Highest Observation: 32.69 ft at 12:35PM Apr 13, 2024Observed: 32.67 ft at 1:33PM Apr 13, 2024Observed: 32.67 ft at 2:31PM Apr 13, 2024Observed: 32.64 ft at 3:30PM Apr 13, 2024Observed: 32.64 ft at 4:28PM Apr 13, 2024Observed: 32.62 ft at 5:26PM Apr 13, 2024Observed: 32.57 ft at 7:23PM Apr 13, 2024Observed: 32.54 ft at 8:21PM Apr 13, 2024Observed: 32.54 ft at 10:18PM Apr 13, 2024Observed: 32.52 ft at 11:16PM Apr 13, 2024Observed: 32.52 ft at 12:15AM Apr 14, 2024Observed: 32.47 ft at 1:13AM Apr 14, 2024Observed: 32.49 ft at 2:11AM Apr 14, 2024Observed: 32.49 ft at 3:10AM Apr 14, 2024Observed: 32.47 ft at 4:08AM Apr 14, 2024Observed: 32.44 ft at 5:06AM Apr 14, 2024Observed: 32.44 ft at 6:05AM Apr 14, 2024Observed: 32.44 ft at 7:03AM Apr 14, 2024Observed: 32.44 ft at 8:01AM Apr 14, 2024Observed: 32.44 ft at 9:58AM Apr 14, 2024Observed: 32.42 ft at 10:56AM Apr 14, 2024Observed: 32.39 ft at 11:55AM Apr 14, 2024Observed: 32.42 ft at 12:53PM Apr 14, 2024Observed: 32.39 ft at 2:50PM Apr 14, 2024Observed: 32.39 ft at 3:48PM Apr 14, 2024Observed: 32.42 ft at 4:46PM Apr 14, 2024Observed: 32.39 ft at 5:45PM Apr 14, 2024Observed: 32.37 ft at 8:40PM Apr 14, 2024Observed: 32.37 ft at 9:38PM Apr 14, 2024Observed: 32.34 ft at 10:36PM Apr 14, 2024Observed: 32.37 ft at 11:35PM Apr 14, 2024Observed: 32.37 ft at 12:33AM Apr 15, 2024Observed: 32.37 ft at 2:30AM Apr 15, 2024Observed: 32.37 ft at 3:28AM Apr 15, 2024Observed: 32.37 ft at 4:26AM Apr 15, 2024Observed: 32.34 ft at 5:25AM Apr 15, 2024Observed: 32.37 ft at 7:21AM Apr 15, 2024Observed: 32.37 ft at 8:20AM Apr 15, 2024Observed: 32.34 ft at 9:18AM Apr 15, 2024Observed: 32.34 ft at 10:16AM Apr 15, 2024Observed: 32.32 ft at 11:15AM Apr 15, 2024Observed: 32.34 ft at 12:13PM Apr 15, 2024Observed: 32.34 ft at 1:11PM Apr 15, 2024Observed: 32.34 ft at 2:10PM Apr 15, 2024Observed: 32.34 ft at 3:08PM Apr 15, 2024Observed: 32.34 ft at 4:06PM Apr 15, 2024Observed: 32.34 ft at 5:05PM Apr 15, 2024Observed: 32.34 ft at 6:03PM Apr 15, 2024Observed: 32.34 ft at 7:01PM Apr 15, 2024Observed: 32.34 ft at 8:00PM Apr 15, 2024Observed: 32.34 ft at 8:58PM Apr 15, 2024Observed: 32.34 ft at 9:56PM Apr 15, 2024Observed: 32.34 ft at 10:55PM Apr 15, 2024Observed: 32.34 ft at 11:53PM Apr 15, 2024Observed: 32.34 ft at 12:51AM Apr 16, 2024PTMC1(plotting HGIRR) Graph Created (4:30AM Apr 16, 2024)ObservedLatest observed value: 32.34 ft at 12:51 AM PDT 16-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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