Owens Dam dam
Owens Dam
Owens Dam, located in Mariposa, California, is a federally-owned structure managed by the US Army Corps of Engineers. Completed in 1949, this earth dam stands at a height of 72 feet and serves primarily for flood risk reduction and hydroelectric purposes along Owens Creek. With a maximum storage capacity of 6,064 acre-feet and normal storage of 4,138 acre-feet, the dam covers a surface area of 175 acres and has a drainage area of 26 square miles.
This high-hazard potential dam features an uncontrolled spillway, with a spillway width of 75 feet, and has a history of periodic inspections to ensure its structural integrity. The USACE actively manages dam-related flood risks by monitoring its condition, conducting maintenance and repairs as needed, and working closely with local emergency managers to develop emergency action plans and evacuation procedures. Despite the risks associated with flood events and dam releases, the USACE is dedicated to mitigating these risks and ensuring the safety of downstream communities. Additional details specific to the risk management measures for Owens Dam will be provided in the future to enhance public awareness and preparedness.
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 Owens Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Turlock Cn Nr La Grange Ca | 912 cfs | → |
| Tuolumne R Bl Lagrange Dam Nr Lagrange Ca | 186 cfs | → |
| Modesto Cn Nr La Grange Ca | 834 cfs | → |
| Big C Div Nr Fish Camp Ca | 0 cfs | → |
| San Joaquin R Bl Friant Ca | 476 cfs | → |
| Nf Willow C Nr Sugar Pine Ca | 416 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Owens Dam.
Boat launches
Campgrounds
- Cordoniz Campground
- Cordoniz Group Area North
- Wildcat Primitive Campground
- Cordoniz Group Area South
- Codorniz Rec Area
- Lake Mcswain Rec Area
Fishing spots
Paddle runs
- Confluence With Middle Fork Tuolumne River To Confluence With Tuolumne River
- Clavey River From Cottonwood Road To Confluence With Tuolumne
- Headwaters Near The Tuolumne And Mariposa County Lines To Western Boundary Of Yosemite National Park
- Clavey River From 3n01 To Cottonwood Road
- Confluence With North Fork San Joaquin River To Hells Half Acre
More reservoirs
Track Owens Dam 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 Owens Dam
Where does the data for Owens Dam 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 Owens Dam.