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Hydrograph River at a Glance Download
San Lorenzo River (CA) at Lomond Street Bridge Stage (ft)Observed: 0 ft at 7:33PM May 31, 2020Observed: 0 ft at 7:47PM May 31, 2020Observed: 0 ft at 8:03PM May 31, 2020Observed: 0 ft at 8:17PM May 31, 2020Observed: 0 ft at 8:33PM May 31, 2020Observed: 0 ft at 8:47PM May 31, 2020Observed: 0 ft at 9:03PM May 31, 2020Observed: 0 ft at 9:17PM May 31, 2020Observed: 0 ft at 9:33PM May 31, 2020Observed: 0 ft at 9:47PM May 31, 2020Observed: 0 ft at 10:03PM May 31, 2020Observed: 0 ft at 10:17PM May 31, 2020Observed: 0 ft at 10:33PM May 31, 2020Observed: 0 ft at 10:47PM May 31, 2020Observed: 0 ft at 11:03PM May 31, 2020Observed: 0 ft at 11:17PM May 31, 2020Observed: 0 ft at 11:33PM May 31, 2020Observed: 0 ft at 11:47PM May 31, 2020Observed: 0 ft at 12:03AM Jun 01, 2020Observed: 0 ft at 12:17AM Jun 01, 2020Observed: 0 ft at 1:03AM Jun 01, 2020Observed: 0 ft at 1:33AM Jun 01, 2020Observed: 0 ft at 1:47AM Jun 01, 2020Observed: 0 ft at 2:03AM Jun 01, 2020Observed: 0 ft at 2:17AM Jun 01, 2020Observed: 0 ft at 2:33AM Jun 01, 2020Observed: 0 ft at 2:47AM Jun 01, 2020Observed: 0 ft at 3:03AM Jun 01, 2020Observed: 0 ft at 3:17AM Jun 01, 2020Observed: 0 ft at 3:33AM Jun 01, 2020Observed: 0 ft at 3:47AM Jun 01, 2020Observed: 0 ft at 4:03AM Jun 01, 2020Observed: 0 ft at 4:17AM Jun 01, 2020Observed: 0 ft at 4:33AM Jun 01, 2020Observed: 0 ft at 4:47AM Jun 01, 2020Observed: 0 ft at 5:03AM Jun 01, 2020Observed: 0 ft at 5:17AM Jun 01, 2020Observed: 0 ft at 5:33AM Jun 01, 2020Observed: 0 ft at 5:47AM Jun 01, 2020Observed: 0 ft at 6:03AM Jun 01, 2020Observed: 0 ft at 6:17AM Jun 01, 2020Observed: 0 ft at 6:33AM Jun 01, 2020Observed: 0 ft at 6:47AM Jun 01, 2020Observed: 0 ft at 7:03AM Jun 01, 2020Observed: 0 ft at 7:17AM Jun 01, 2020Observed: 0 ft at 7:33AM Jun 01, 2020Observed: 0 ft at 7:47AM Jun 01, 2020Observed: 0 ft at 8:17AM Jun 01, 2020Observed: 0 ft at 8:33AM Jun 01, 2020Observed: 0 ft at 8:47AM Jun 01, 2020Observed: 0 ft at 9:03AM Jun 01, 2020Observed: 0 ft at 9:17AM Jun 01, 2020Observed: 0 ft at 9:33AM Jun 01, 2020Observed: 0 ft at 9:47AM Jun 01, 2020Observed: 0 ft at 10:03AM Jun 01, 2020Observed: 0 ft at 10:17AM Jun 01, 2020Observed: 0 ft at 10:33AM Jun 01, 2020Observed: 0 ft at 11:03AM Jun 01, 2020Observed: 0 ft at 11:33AM Jun 01, 2020Observed: 0.01 ft at 12:03PM Jun 01, 2020Observed: 0 ft at 12:17PM Jun 01, 2020Observed: 0.01 ft at 12:33PM Jun 01, 2020Observed: 0 ft at 12:47PM Jun 01, 2020Observed: 0 ft at 1:03PM Jun 01, 2020Observed: 0 ft at 1:17PM Jun 01, 2020Observed: 0 ft at 1:33PM Jun 01, 2020Observed: 0 ft at 1:47PM Jun 01, 2020Observed: 0 ft at 2:03PM Jun 01, 2020Observed: 0 ft at 2:17PM Jun 01, 2020Observed: 0 ft at 2:33PM Jun 01, 2020Observed: 0 ft at 3:03PM Jun 01, 2020Observed: 0 ft at 3:33PM Jun 01, 2020Observed: 0 ft at 3:47PM Jun 01, 2020Observed: 0 ft at 4:03PM Jun 01, 2020Observed: 0 ft at 4:17PM Jun 01, 2020Observed: 0 ft at 4:33PM Jun 01, 2020Observed: 0 ft at 4:47PM Jun 01, 2020Observed: 0 ft at 5:03PM Jun 01, 2020Observed: 0 ft at 5:17PM Jun 01, 2020Observed: 0 ft at 5:33PM Jun 01, 2020Observed: 0 ft at 5:47PM Jun 01, 2020Observed: 0 ft at 6:03PM Jun 01, 2020Observed: 0 ft at 6:17PM Jun 01, 2020Observed: 0 ft at 6:33PM Jun 01, 2020Observed: 0 ft at 6:47PM Jun 01, 2020Observed: 0 ft at 7:03PM Jun 01, 2020Observed: 0 ft at 7:17PM Jun 01, 2020Observed: 0 ft at 7:33PM Jun 01, 2020Observed: 0 ft at 7:47PM Jun 01, 2020Observed: 0 ft at 8:03PM Jun 01, 2020Observed: 0 ft at 8:17PM Jun 01, 2020Observed: 0 ft at 8:33PM Jun 01, 2020Observed: 0 ft at 9:03PM Jun 01, 2020Observed: 0 ft at 9:33PM Jun 01, 2020Observed: 0 ft at 9:47PM Jun 01, 2020Observed: 0 ft at 10:03PM Jun 01, 2020Observed: 0 ft at 10:17PM Jun 01, 2020Observed: 0 ft at 10:33PM Jun 01, 2020Observed: 0 ft at 10:47PM Jun 01, 2020Observed: 0 ft at 11:03PM Jun 01, 2020Observed: 0 ft at 11:17PM Jun 01, 2020Observed: 0 ft at 11:33PM Jun 01, 2020Observed: 0 ft at 11:47PM Jun 01, 2020Observed: 0 ft at 12:03AM Jun 02, 2020Observed: 0 ft at 12:17AM Jun 02, 2020Observed: 0 ft at 12:33AM Jun 02, 2020Observed: 0 ft at 12:47AM Jun 02, 2020Observed: 0 ft at 1:03AM Jun 02, 2020Observed: 0 ft at 1:17AM Jun 02, 2020Observed: 0 ft at 1:33AM Jun 02, 2020Observed: 0 ft at 1:47AM Jun 02, 2020Observed: 0 ft at 2:03AM Jun 02, 2020Observed: 0 ft at 2:17AM Jun 02, 2020Observed: 0 ft at 2:33AM Jun 02, 2020Observed: 0 ft at 2:47AM Jun 02, 2020Observed: 0 ft at 3:03AM Jun 02, 2020Observed: 0 ft at 3:17AM Jun 02, 2020Observed: 0 ft at 3:33AM Jun 02, 2020Observed: 0 ft at 3:47AM Jun 02, 2020Observed: 0 ft at 4:03AM Jun 02, 2020Observed: 0 ft at 4:17AM Jun 02, 2020Observed: 0 ft at 4:33AM Jun 02, 2020Observed: 0 ft at 4:47AM Jun 02, 2020Observed: 0 ft at 5:03AM Jun 02, 2020Observed: 0 ft at 5:17AM Jun 02, 2020Observed: 0 ft at 5:33AM Jun 02, 2020Observed: 0 ft at 5:47AM Jun 02, 2020Observed: 0 ft at 6:03AM Jun 02, 2020Observed: 0.01 ft at 6:17AM Jun 02, 2020Observed: 0.01 ft at 6:33AM Jun 02, 2020Observed: 0.01 ft at 6:47AM Jun 02, 2020Observed: 0.01 ft at 7:03AM Jun 02, 2020Observed: 0.01 ft at 7:17AM Jun 02, 2020Observed: 0.01 ft at 7:33AM Jun 02, 2020Observed: 0.01 ft at 7:47AM Jun 02, 2020Observed: 0.02 ft at 8:03AM Jun 02, 2020Observed: 0.02 ft at 8:17AM Jun 02, 2020Observed: 0.02 ft at 8:33AM Jun 02, 2020Observed: 0.02 ft at 8:47AM Jun 02, 2020Observed: 0.02 ft at 9:03AM Jun 02, 2020Observed: 0.02 ft at 9:17AM Jun 02, 2020Observed: 0.02 ft at 9:33AM Jun 02, 2020Observed: 0.02 ft at 9:47AM Jun 02, 2020Observed: 0.01 ft at 10:03AM Jun 02, 2020Observed: 0.02 ft at 10:33AM Jun 02, 2020Observed: 0.02 ft at 10:47AM Jun 02, 2020Observed: 0.02 ft at 11:03AM Jun 02, 2020Observed: 0.01 ft at 11:17AM Jun 02, 2020Observed: 0.01 ft at 11:33AM Jun 02, 2020Observed: 0 ft at 11:47AM Jun 02, 2020Observed: 0.01 ft at 12:17PM Jun 02, 2020Observed: 0.01 ft at 12:33PM Jun 02, 2020Observed: 0.01 ft at 12:47PM Jun 02, 2020Observed: 0.01 ft at 1:03PM Jun 02, 2020Observed: 0 ft at 1:17PM Jun 02, 2020Observed: 0 ft at 1:33PM Jun 02, 2020Observed: 0 ft at 1:47PM Jun 02, 2020Observed: 0 ft at 2:03PM Jun 02, 2020Observed: 0.01 ft at 2:17PM Jun 02, 2020Observed: 0.01 ft at 2:33PM Jun 02, 2020Observed: 0.01 ft at 2:47PM Jun 02, 2020Observed: 0.01 ft at 3:03PM Jun 02, 2020Observed: 0 ft at 3:17PM Jun 02, 2020Observed: 0 ft at 3:33PM Jun 02, 2020Observed: 0 ft at 3:47PM Jun 02, 2020Observed: 0 ft at 4:03PM Jun 02, 2020Observed: 0.01 ft at 4:17PM Jun 02, 2020Observed: 0.02 ft at 4:47PM Jun 02, 2020Observed: 0.02 ft at 5:03PM Jun 02, 2020Observed: 0.02 ft at 5:17PM Jun 02, 2020Observed: 0.02 ft at 5:33PM Jun 02, 2020Observed: 0.02 ft at 5:47PM Jun 02, 2020Observed: 0.02 ft at 6:03PM Jun 02, 2020Observed: 0.02 ft at 6:17PM Jun 02, 2020Observed: 0.02 ft at 6:33PM Jun 02, 2020Observed: 0 ft at 6:47PM Jun 02, 2020Observed: 0.02 ft at 7:03PM Jun 02, 2020Observed: 0.02 ft at 7:17PM Jun 02, 2020Observed: 0.01 ft at 7:33PM Jun 02, 2020Observed: 0.02 ft at 7:47PM Jun 02, 2020Observed: 0.02 ft at 8:03PM Jun 02, 2020Observed: 0.02 ft at 8:17PM Jun 02, 2020Observed: 0.02 ft at 8:33PM Jun 02, 2020Observed: 0.02 ft at 8:47PM Jun 02, 2020Observed: 0.02 ft at 9:17PM Jun 02, 2020Observed: 0.02 ft at 9:33PM Jun 02, 2020Observed: 0.02 ft at 9:47PM Jun 02, 2020Observed: 0.02 ft at 10:03PM Jun 02, 2020Observed: 0.02 ft at 10:17PM Jun 02, 2020Observed: 0 ft at 10:33PM Jun 02, 2020Observed: 0 ft at 10:47PM Jun 02, 2020Observed: 0.01 ft at 11:03PM Jun 02, 2020Observed: 0.01 ft at 11:17PM Jun 02, 2020Observed: 0 ft at 11:33PM Jun 02, 2020Observed: 0.01 ft at 11:47PM Jun 02, 2020Observed: 0.02 ft at 12:03AM Jun 03, 2020Observed: 0.02 ft at 12:17AM Jun 03, 2020Observed: 0.01 ft at 12:33AM Jun 03, 2020Observed: 0 ft at 12:47AM Jun 03, 2020Observed: 0 ft at 1:03AM Jun 03, 2020Observed: 0 ft at 1:17AM Jun 03, 2020Observed: 0 ft at 1:33AM Jun 03, 2020Observed: 0 ft at 1:47AM Jun 03, 2020Observed: 0 ft at 2:03AM Jun 03, 2020Observed: 0 ft at 2:17AM Jun 03, 2020Observed: 0 ft at 2:33AM Jun 03, 2020Observed: 0 ft at 2:47AM Jun 03, 2020Observed: 0.02 ft at 3:03AM Jun 03, 2020Observed: 0.02 ft at 3:17AM Jun 03, 2020Observed: 0.02 ft at 3:33AM Jun 03, 2020Observed: 0.02 ft at 3:47AM Jun 03, 2020Observed: 0.02 ft at 4:03AM Jun 03, 2020Observed: 0.02 ft at 4:17AM Jun 03, 2020Observed: 0.02 ft at 4:33AM Jun 03, 2020Observed: 0.02 ft at 4:47AM Jun 03, 2020Observed: 0.02 ft at 5:03AM Jun 03, 2020Observed: 0.02 ft at 5:17AM Jun 03, 2020Observed: 0.02 ft at 5:33AM Jun 03, 2020Observed: 0.02 ft at 5:47AM Jun 03, 2020Observed: 0.03 ft at 6:03AM Jun 03, 2020Observed: 0.04 ft at 6:17AM Jun 03, 2020Observed: 0.04 ft at 6:33AM Jun 03, 2020Observed: 0.04 ft at 6:47AM Jun 03, 2020Observed: 0.04 ft at 7:03AM Jun 03, 2020Observed: 0.04 ft at 7:17AM Jun 03, 2020Observed: 0.04 ft at 7:33AM Jun 03, 2020Observed: 0.04 ft at 7:47AM Jun 03, 2020Observed: 0.04 ft at 8:03AM Jun 03, 2020Observed: 0.04 ft at 8:17AM Jun 03, 2020Observed: 0.04 ft at 8:33AM Jun 03, 2020Observed: 0.04 ft at 8:47AM Jun 03, 2020Observed: 0.04 ft at 9:03AM Jun 03, 2020Observed: 0.04 ft at 9:17AM Jun 03, 2020Observed: 0.04 ft at 9:33AM Jun 03, 2020Observed: 0.04 ft at 9:47AM Jun 03, 2020Observed: 0.04 ft at 10:03AM Jun 03, 2020Observed: 0.04 ft at 10:17AM Jun 03, 2020Observed: 0.04 ft at 10:33AM Jun 03, 2020Observed: 0.04 ft at 10:47AM Jun 03, 2020Observed: 0.04 ft at 11:03AM Jun 03, 2020Observed: 0.04 ft at 11:17AM Jun 03, 2020Observed: 0.02 ft at 11:33AM Jun 03, 2020Observed: 0.04 ft at 11:47AM Jun 03, 2020Observed: 0.05 ft at 12:03PM Jun 03, 2020Observed: 0.05 ft at 12:17PM Jun 03, 2020Observed: 0.05 ft at 12:33PM Jun 03, 2020Observed: 0.05 ft at 12:47PM Jun 03, 2020Observed: 0.05 ft at 1:03PM Jun 03, 2020Observed: 0.05 ft at 1:17PM Jun 03, 2020Observed: 0.04 ft at 1:33PM Jun 03, 2020Observed: 0.02 ft at 1:47PM Jun 03, 2020Observed: 0.02 ft at 2:03PM Jun 03, 2020Observed: 0.01 ft at 2:17PM Jun 03, 2020Observed: 0.02 ft at 2:33PM Jun 03, 2020Highest Observation: 0.06 ft at 2:47PM Jun 03, 2020Highest Observation: 0.06 ft at 3:03PM Jun 03, 2020Highest Observation: 0.06 ft at 3:17PM Jun 03, 2020Highest Observation: 0.06 ft at 3:33PM Jun 03, 2020Highest Observation: 0.06 ft at 3:47PM Jun 03, 2020Highest Observation: 0.06 ft at 4:03PM Jun 03, 2020Highest Observation: 0.06 ft at 4:17PM Jun 03, 2020Highest Observation: 0.06 ft at 4:33PM Jun 03, 2020Highest Observation: 0.06 ft at 4:47PM Jun 03, 2020Highest Observation: 0.06 ft at 5:03PM Jun 03, 2020Highest Observation: 0.06 ft at 5:17PM Jun 03, 2020Highest Observation: 0.06 ft at 5:33PM Jun 03, 2020Highest Observation: 0.06 ft at 5:47PM Jun 03, 2020Highest Observation: 0.06 ft at 6:03PM Jun 03, 2020Highest Observation: 0.06 ft at 6:17PM Jun 03, 2020Highest Observation: 0.06 ft at 6:33PM Jun 03, 2020Highest Observation: 0.06 ft at 6:47PM Jun 03, 2020Highest Observation: 0.06 ft at 7:03PM Jun 03, 2020IWNC1(plotting HGIRR) Graph Created (7:30PM Jun 3, 2020)ObservedLatest observed value: 0.06 ft at 7:03 PM PDT 3-Jun-2020. Flood Stage is 24 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 San Lorenzo River (CA) at Lomond Street 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: 28
Moderate Flood Stage: 26
Flood Stage: 24
Action Stage: 21
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.
Zoom Level:16
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
If you notice any errors in the below information, please contact our Webmaster
28 Major Flooding. Major flooding of homes and businesses in downtown Boulder Creek between Railroad Avenue and the San Lorenzo River and riverfront properties both up- and downstream of the town center. Highway 9 is not expected to flood at these levels, but could be damaged and/or blocked by slides and other hazards.
26 Moderate Flooding. Increased inundation of downtown Boulder Creek between Railroad Avenue and the San Lorenzo River, and of riverfront properties along Irwin Way, Camp Joy Road, and Lorenzo Avenue.
24 Minor Flooding. Lomond Street/Irwin Way begins to flood. As flood water rise, inundation may expand westward into E Lomond Street, Middleton Ave, and Junction Ave. Riverfront homes along Irwin Way, Camp Joy Road, and Lorenzo Avenue may be flooded. NWS will issue a Flash Flood Warning, if not yet already issued.
21 Monitor Stage. Water reaches bridge chord. Backwatering is possible. Flood wave travel time from Boulder Creek to the Big Trees gage in Felton, near Felton Grove, is 30 to 145 minutes. NWS may issue a Flash Flood Watch, if not yet already issued.
About This Location Collapse

Latitude: 37.125833° N, Longitude: 122.118889° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 24 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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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
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Page last modified: 1-Mar-2019 12:32 AM
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