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Hydrograph River at a Glance Download
Willow Brook at Old Redwood Highway Bridge Stage (ft)Observed: 32.19 ft at 6:30AM May 14, 2024Observed: 32.19 ft at 7:28AM May 14, 2024Observed: 32.19 ft at 8:26AM May 14, 2024Observed: 32.22 ft at 9:25AM May 14, 2024Observed: 32.19 ft at 10:23AM May 14, 2024Observed: 32.19 ft at 11:21AM May 14, 2024Observed: 32.22 ft at 12:20PM May 14, 2024Observed: 32.19 ft at 1:18PM May 14, 2024Observed: 32.22 ft at 2:16PM May 14, 2024Observed: 32.22 ft at 3:15PM May 14, 2024Observed: 32.22 ft at 4:13PM May 14, 2024Observed: 32.19 ft at 5:11PM May 14, 2024Observed: 32.19 ft at 6:10PM May 14, 2024Observed: 32.19 ft at 7:08PM May 14, 2024Observed: 32.19 ft at 8:06PM May 14, 2024Observed: 32.22 ft at 10:03PM May 14, 2024Observed: 32.19 ft at 11:01PM May 14, 2024Observed: 32.19 ft at 12:00AM May 15, 2024Observed: 32.19 ft at 12:58AM May 15, 2024Observed: 32.19 ft at 1:56AM May 15, 2024Observed: 32.19 ft at 2:55AM May 15, 2024Observed: 32.19 ft at 3:53AM May 15, 2024Observed: 32.19 ft at 4:51AM May 15, 2024Observed: 32.22 ft at 5:50AM May 15, 2024Highest Observation: 32.24 ft at 6:48AM May 15, 2024Highest Observation: 32.24 ft at 9:43AM May 15, 2024Highest Observation: 32.24 ft at 10:41AM May 15, 2024Highest Observation: 32.24 ft at 11:40AM May 15, 2024Highest Observation: 32.24 ft at 12:38PM May 15, 2024Highest Observation: 32.24 ft at 1:36PM May 15, 2024Highest Observation: 32.24 ft at 2:35PM May 15, 2024Highest Observation: 32.24 ft at 3:33PM May 15, 2024Observed: 32.22 ft at 4:31PM May 15, 2024Observed: 32.19 ft at 5:30PM May 15, 2024Observed: 32.19 ft at 6:28PM May 15, 2024Observed: 32.17 ft at 7:26PM May 15, 2024Observed: 32.19 ft at 8:25PM May 15, 2024Observed: 32.19 ft at 9:23PM May 15, 2024Observed: 32.19 ft at 10:21PM May 15, 2024Observed: 32.19 ft at 11:20PM May 15, 2024Observed: 32.19 ft at 12:18AM May 16, 2024Observed: 32.19 ft at 1:16AM May 16, 2024Observed: 32.22 ft at 2:15AM May 16, 2024Observed: 32.22 ft at 3:13AM May 16, 2024Observed: 32.22 ft at 4:11AM May 16, 2024Observed: 32.19 ft at 5:10AM May 16, 2024Observed: 32.22 ft at 6:08AM May 16, 2024Observed: 32.19 ft at 7:06AM May 16, 2024Observed: 32.19 ft at 8:05AM May 16, 2024Observed: 32.19 ft at 9:03AM May 16, 2024Observed: 32.19 ft at 10:01AM May 16, 2024Observed: 32.22 ft at 11:58AM May 16, 2024Observed: 32.19 ft at 12:56PM May 16, 2024Observed: 32.22 ft at 1:55PM May 16, 2024Observed: 32.19 ft at 2:53PM May 16, 2024Observed: 32.19 ft at 4:50PM May 16, 2024Observed: 32.17 ft at 5:48PM May 16, 2024Observed: 32.17 ft at 6:46PM May 16, 2024Observed: 32.17 ft at 7:45PM May 16, 2024Observed: 32.17 ft at 8:43PM May 16, 2024Observed: 32.17 ft at 9:41PM May 16, 2024Observed: 32.19 ft at 10:40PM May 16, 2024Observed: 32.17 ft at 11:38PM May 16, 2024Observed: 32.17 ft at 12:36AM May 17, 2024Observed: 32.17 ft at 1:35AM May 17, 2024Observed: 32.17 ft at 2:33AM May 17, 2024Observed: 32.19 ft at 3:31AM May 17, 2024Observed: 32.19 ft at 4:30AM May 17, 2024Observed: 32.19 ft at 5:28AM May 17, 2024Observed: 32.17 ft at 6:26AM May 17, 2024Observed: 32.19 ft at 7:25AM May 17, 2024Observed: 32.17 ft at 8:23AM May 17, 2024Observed: 32.19 ft at 9:21AM May 17, 2024Observed: 32.19 ft at 10:20AM May 17, 2024Observed: 32.17 ft at 11:18AM May 17, 2024Observed: 32.19 ft at 2:13PM May 17, 2024Observed: 32.19 ft at 3:11PM May 17, 2024Observed: 32.17 ft at 4:10PM May 17, 2024Observed: 32.19 ft at 5:08PM May 17, 2024Observed: 32.17 ft at 6:06PM May 17, 2024Observed: 32.17 ft at 7:05PM May 17, 2024Observed: 32.17 ft at 8:03PM May 17, 2024Observed: 32.17 ft at 9:01PM May 17, 2024Observed: 32.17 ft at 10:00PM May 17, 2024Observed: 32.17 ft at 10:58PM May 17, 2024Observed: 32.17 ft at 11:56PM May 17, 2024Observed: 32.19 ft at 12:55AM May 18, 2024Observed: 32.17 ft at 1:53AM May 18, 2024Observed: 32.17 ft at 2:51AM May 18, 2024Observed: 32.17 ft at 3:50AM May 18, 2024Observed: 32.22 ft at 4:48AM May 18, 2024Observed: 32.17 ft at 5:43AM May 18, 2024Observed: 32.19 ft at 5:46AM May 18, 2024Observed: 32.17 ft at 6:45AM May 18, 2024Observed: 32.17 ft at 7:43AM May 18, 2024Observed: 32.17 ft at 8:41AM May 18, 2024Observed: 32.17 ft at 9:40AM May 18, 2024Observed: 32.17 ft at 10:38AM May 18, 2024Observed: 32.19 ft at 11:36AM May 18, 2024Observed: 32.17 ft at 12:35PM May 18, 2024Observed: 32.19 ft at 1:33PM May 18, 2024Observed: 32.17 ft at 2:31PM May 18, 2024Observed: 32.17 ft at 3:30PM May 18, 2024Observed: 32.17 ft at 4:28PM May 18, 2024Observed: 32.17 ft at 5:26PM May 18, 2024Observed: 32.17 ft at 6:25PM May 18, 2024Observed: 32.19 ft at 7:23PM May 18, 2024Observed: 32.17 ft at 8:21PM May 18, 2024Observed: 32.17 ft at 9:20PM May 18, 2024Observed: 32.17 ft at 10:18PM May 18, 2024Observed: 32.17 ft at 11:16PM May 18, 2024Observed: 32.17 ft at 12:15AM May 19, 2024Observed: 32.17 ft at 2:11AM May 19, 2024PTMC1(plotting HGIRR) Graph Created (5:46AM May 19, 2024)ObservedLatest observed value: 32.17 ft at 2:11 AM PDT 19-May-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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