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Hydrograph River at a Glance Download
Sleepy Hollow Creek at Ross Fire Sta 21 Stage (ft)Observed: 2.23 ft at 11:45AM Oct 11, 2019Observed: 2.22 ft at 11:45PM Oct 11, 2019Observed: 2.23 ft at 11:45AM Oct 12, 2019Observed: 2.23 ft at 11:45PM Oct 12, 2019Observed: 2.23 ft at 11:45AM Oct 13, 2019Highest Observation: 2.24 ft at 11:45PM Oct 13, 2019Highest Observation: 2.24 ft at 9:01PM Oct 14, 2019Observed: 2.23 ft at 9:01AM Oct 15, 2019Observed: 2.23 ft at 9:01PM Oct 15, 2019SYIC1(plotting HGIRR) Graph Created (2:30AM Oct 16, 2019)ObservedLatest observed value: 2.23 ft at 9:01 PM PDT 15-Oct-2019. Flood Stage is 6.6 ft
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Datum: Not Available
NOTE: Graphical forecasts are not available for the Sleepy Hollow Creek at Ross Fire Sta 21. 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: 9.1
Moderate Flood Stage: 7.8
Flood Stage: 6.6
Action Stage: 4.4
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.
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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.
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9.1 Major Flood Stage. Ross Valley Fire Station 20 flooded along with surrounding neighborhood. Arroyo Avenue, Butterfield Road, and other local roadways flooded, making travel difficult and dangerous.
7.8 Moderate Flood Stage. Water levels are above capacity of Arroyo Avenue culvert and have reached the underside of Ross Valley Fire Station 20. Backwatering and obstruction beneath Fire Station could cause overflow locally. Overflow may inundate Butterfield Road.
6.6 Minor Flood Stage. Culvert beneath Arroyo Avenue full and likely backwatered upstream. Possible overflow onto Arroyo Avenue, and other localized areas of flooding from creek water may be occurring. NWS will issue a Flash Flood Warning if not yet already issued.
4.4 Monitor Stage. Arroyo Avenue drain outfalls into Sleepy Hollow Creek backwatered. Street flooding from storm drains possible. NWS will issue a Flash Flood Watch if not yet already issued.
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Latitude: 37.991667° N, Longitude: 122.576111° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 6.6 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 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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Monterey, CA 93943-5505
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Page last modified: 1-Mar-2019 12:32 AM
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