Swanzy Lake dam
Swanzy Lake
Swanzy Lake, located in Vallejo, California, is a local government-owned reservoir that serves as a crucial water supply for irrigation and domestic use in the region. Completed in 1931, this earth dam has a height of 86 feet and a storage capacity of 107 acre-feet, making it a significant water resource for the community. The dam sits on the Tr Carquinez Str river and is regulated by the California Department of Water Resources for safety and inspection.
With a surface area of 4 acres and a drainage area of 0.1 square miles, Swanzy Lake plays a vital role in managing water resources in Solano County. Despite its high hazard potential, the dam's condition is assessed as satisfactory, with regular inspections to ensure its stability and safety. The emergency action plan for the reservoir was last revised in 2017, demonstrating a commitment to preparedness and risk management in the face of potential hazards.
For water resource and climate enthusiasts, Swanzy Lake stands as a testament to the careful management and regulation of water infrastructure in California. As a key source of water supply for the region, this reservoir highlights the importance of maintaining and monitoring dams to ensure the safety and sustainability of water resources for future generations. The collaborative efforts between local government agencies and the Department of Water Resources exemplify a commitment to responsible water management in the face of changing climate conditions.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Swanzy Lake -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Nathanson C A Sonoma Ca | 0 cfs | → |
| Novato C A Novato Ca | 0 cfs | → |
| Corte Madera C A Ross Ca | 4 cfs | → |
| Napa R Nr Napa Ca | 40 cfs | → |
| Sonoma C A Agua Caliente Ca | 14 cfs | → |
| Redwood C A Hwy 1 Bridge A Muir Beach Ca | 2 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Swanzy Lake.
Boat launches
- Curtola Parkway 139-199, Vallejo
- North Camino Alto Vallejo
- Cuttings Wharf Road 3270, Napa
- Cuttings Wharf Road 3175-3337, Napa
- Napa Valley Vine Trail, Napa
- Mcavoy Road 1099, Bay Point
Campgrounds
- Rowser Garden Camping (No Reservation Needed)
- Browers Garden Camping - No Reservation Needed
- Wee-Ta-Chi
- Maud Whalen
- Camp Herms Bsa
- Homestead Valley
Fishing spots
- 9th Street Boat Ramp
- City Of Benicia Fishing Pier
- San Pablo Reservoir
- Lafayette Reservoir
- Berkeley Yacht Harbor
- Lake Temescal
Paddle runs
- Headwaters To Mouth
- Headwaters To Ends One Quarter Mile South Of Bear Valley Road Bridge Segment 1: Ends 1/4 Mile South Of Bear Valley Road Bridge Segment 2: Caltrans Corporation Yard At Point Reyes Staton.
- Olema Ranch Campground To Caltrans Corporation Yard At Point Reyes Station
Track Swanzy Lake in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Swanzy Lake
Where does the data for Swanzy Lake come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the High hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Swanzy Lake.