San Tomas Aquino Creek above Williams Road
California — Water Level & Flood Stage
Located in Santa Clara County, California on the San Tomas Aquino Creek. Live water level data from USGS, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: TMSC1). Live data may be limited. View on NWS AHPS →
Flood Stages
Major Flood
6.7 ft
4,916 cfs
Moderate Flood
6.4 ft
3,389 cfs
Minor Flood
6.2 ft
2,645 cfs
Action Stage
5.8 ft
1,611 cfs
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
6.71 ft
Major Flooding...If Saratoga Creek has substantial flows, overbanking will occur on the east bank between US-101 and Scott Blvd, bounded by the creek and San Tomas Expwy, inundating the office park.
6.7 ft
Major Flooding: San Tomas Expwy flooded, with water moving northward under the I-280 viaduct towards Homestead. Water sheet flows along roads towards Pruneridge Golf Course. Extensive flooding stemming from the daylighted culvert upstream of Homestead Rd. Areas east of Kiely Blvd and west of Scott Blvd are at risk. Floodwaters may continue to move northward, bounded by San Tomas and Scott Blvd, crossing the Caltraintracks toward US-101...
6.4 ft
Moderate Flooding: Spills upstream of Williams Road move toward the west and move northward along Boynton Ave, ponding along I-280. Worst flooding east of Boynton High School. Overbanking upstream of Homestead Rd spread along San Tomas Expwy moves northward and spreads into surrounding neighborhoods. If Saratoga Creek has substantial flows as well, overbanking on the east bank is possible between US-101 and Scott Blvd.
6.2 ft
Minor Flooding: Overbanking possible near Williams Road, Payne Ave, West Hamilton Ave, and Campbell Ave, causing street flooding. Possible overbanking onto San Tomas Expwy between Homestead Rd and Forbes Ave, where the underground culvert daylights for a short stretch.
5.8 ft
Action Stage
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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About This Gauge
NWS LID
TMSC1
River
San Tomas Aquino Creek
County
Santa Clara, CA
Coordinates
37.3065°N, 121.9643°W
Get Flood Alerts for San Tomas Aquino Creek
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of San Tomas Aquino Creek above Williams Road?
The San Tomas Aquino Creek above Williams Road gauge is maintained by USGS and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for San Tomas Aquino Creek above Williams Road?
The NWS-defined flood stage for San Tomas Aquino Creek above Williams Road is 6.2 feet. Action stage begins at 5.8 feet. Moderate flooding starts at 6.4 feet, and major flooding at 6.7 feet.
How do I get alerts when San Tomas Aquino Creek rises?
Download StormCast free on Google Play, go to River Gauges, and add San Tomas Aquino Creek above Williams Road to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the San Tomas Aquino Creek above Williams Road gauge located?
The gauge is located in Santa Clara County, California at coordinates 37.3065°N, 121.9643°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: SCVWD