Skip Navigation Link  
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
Colgan Creek near Santa Rosa Stage (ft)USGS--Water Resources of the United StatesEASC1(plotting HGIRG) Graph Created (5:45AM May 21, 2022)Flood Stage is 106 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (PDT)
XML Data
RSS Files
Datum: NGVD29
NOTE: Graphical forecasts are not available for the Colgan Creek near Santa Rosa. 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: 109
Moderate Flood Stage: 108
Flood Stage: 106
Action Stage: 104
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
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
109 Major floodplain inundation in vicinity of Elsie Allen High School and possibly elsewhere along Colgan Creek near Santa Rosa. Bellevue Avenue also heavily inundated by flood waters and possibly impassable by vehicle and foot traffic. Roadway and sidewalk manhole covers may be backpressured and missing.
108 Adjacent maintenance road on north (right bank) side of channel flooded. Culvert that serves Colgan Creek beneath Burgess Drive fully submerged and likely backwatered. Channel banks overtopped and Elsie Allen ballfield begins to flood. NWS will issue a Flash Flood Warning, if not yet already issued.
106 Adjacent maintenance road on north (right bank) side of channel flooded downstream of Burgess Drive bridge. Creek water levels have reached the elevation of storm drains serving runoff on Bellevue Avenue, so evacuation of runoff from the roadway and sidewalk may be limited or halted. Resultant roadway runoff may build up, causing localized urban roadway flooding. NWS will issue an Urban/Small Stream Advisory, if not yet already issued.
104 Monitor stage. Many adjacent storm drain outlets within the creek channel that serve surrounding floodplain and roadways in the vicinity of Elsie Allen High School are submerged and may begin to backwater. NWS may issue a Flash Flood Watch, if not yet already issued.
About This Location Collapse

Latitude: 38.402135° N, Longitude: 122.733043° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 106 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(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 29 100 ft 206 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:

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: 2-Nov-2020 7:27 PM
Privacy Policy
About Us
Career Opportunities