San Antonio dam
San Antonio
San Antonio, a public utility located in Bradley, California, operates a dam on the San Antonio River for flood risk reduction, irrigation, and water supply purposes. The earth dam, with a height of 202 feet and a length of 1433 feet, was completed in 1965 and has a storage capacity of 350,000 acre-feet. The dam is under state regulation and inspection by the Department of Water Resources (DWR) and the Safety of Dams agency, ensuring its safety and compliance with state requirements.
The dam's hazard potential is considered high, but its condition assessment is fair as of April 2019. Regular inspections occur every year, with the last one conducted in November 2020. Although no major modifications or risk management measures are noted in the data, the dam's emergency action plan (EAP) status and adherence to guidelines are unspecified. With its strategic location in Monterey County and its pivotal role in managing water resources, San Antonio Dam serves as a crucial infrastructure piece for the region's water security and flood protection needs.
Represented within the San Francisco District, the dam stands as a key asset in the region's water infrastructure, with the potential to mitigate flood risks and provide essential water supplies for irrigation and other purposes. As climate change continues to impact water resources, the role of San Antonio Dam in ensuring water security and managing risks associated with natural disasters like floods becomes increasingly vital. Moving forward, ongoing maintenance, risk assessments, and adherence to regulatory standards will be crucial in safeguarding this essential piece of infrastructure for the community and the environment.
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 San Antonio -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Nacimiento R Bl Nacimiento Dam Nr Bradley Ca | 264 cfs | → |
| Salinas R Nr Bradley Ca | 367 cfs | → |
| Nacimiento R Bl Sapaque C Nr Bryson Ca | 2 cfs | → |
| San Antonio R Nr Lockwood Ca | · | → |
| Estrella R Nr Estrella Ca | 0 cfs | → |
| Salinas R A Paso Robles Ca | 1 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near San Antonio.
Boat launches
- Resort Drive San Luis Obispo County
- Resort Drive, Paso Robles
- Lynch Road, Bradley
- Village Road San Luis Obispo County
- New Pleyto Road, Bradley
- Saddle Way San Luis Obispo County
Campgrounds
- Lake Nacimiento
- Eagles Ridge Campground
- Pine Knoll Campground
- Oak Knoll Campground
- South Shore San Antonio
- Quails Roost Campground
Fishing spots
- Lake San Antonio
- Nacimiento Lake
- Lake Nacimiento
- Barney Schwartz Park Lake
- Franklin Hot Springs
- Whale Rock Reservoir
Paddle runs
Track San Antonio 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 San Antonio
Where does the data for San Antonio 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 San Antonio.