San Lorenzo Creek (Alameda) above Hayward, CA
River level and flood forecast · Alameda County
Normal2.6 ftas of Mon 10:20 PM
The river is 22.1 ft below flood stage (24.64 ft).
Forecast to hold near 2.6 ft through Sat, Oct 17, 5 AM.
Flow: 1 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 7:35 AM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts San Lorenzo Creek (Alameda) above Hayward to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 33 ft |
| Moderate flood stage | 29.64 ft |
| Flood stage | 24.64 ft |
| Action stage | 20.85 ft |
What floods at each level
From the National Weather Service, highest first.
- 33 ftMajor Flooding. Homes and local roadways inundated with several feet of water.
- 29.64 ftModerate Flooding. Homes and roadways adjacent to the creek in this location begin to flood.
- 24.64 ftMinor Flooding. At 24.64 feet, flooding may have begun downstream at the San Lorenzo Creek near San Lorenzo stream gage. NWS will issue Flash Flood Warning if not already issued.
- 20.85 ftAction Stage. At 20.85 feet the San Lorenzo Creek near San Lorenzo gage downstream is close to flooding. NWS will issue a Flash Flood Watch if not already issued.
Up and down the river, and nearby
- UpstreamSan Lorenzo Creek (Alameda) above Don Castro Reservoir near Castro Valley, CA
- DownstreamSan Lorenzo Creek (Alameda) at San Lorenzo, CA
- Castro Valley Creek at Hayward, CA
- Crow Creek near Hayward, CA
- Cull Creek above Cull Creek Reservoir near Castro Valley, CA
- Dry Creek at Union City, CA
- Alameda Creek Flood Channel at Union City, CA
- San Ramon Creek at San Ramon, CA
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (LRZC1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.