O.C. Fisher Dam dam
O.C. Fisher Dam
O.C. Fisher Dam, also known as O. C. Fisher Lake, is a Federal-owned earth dam located on the Concho River in San Angelo, Texas. Completed in 1952, the dam primarily serves the purpose of flood risk reduction, with additional benefits including fish and wildlife pond, recreation, and water supply. With a height of 128 feet and a length of 40,885 feet, the dam has a storage capacity of 766,000 acre-feet and a surface area of 5,400 acres.
Despite its role in reducing flood risk to downstream communities, a risk assessment conducted in May 2020 classified the dam's hazard potential as high due to the large population living in the immediate downstream area. The most significant risk comes from high-volume releases through the uncontrolled spillway during extreme weather events, potentially putting thousands of people at risk. To mitigate these risks, regular inspections, surveillance, and maintenance are conducted, while an updated Emergency Action Plan ensures coordinated responses in case of emergencies. A planned study in 2022 aims to further analyze and reduce the risks associated with the dam, highlighting ongoing efforts to safeguard the surrounding communities and infrastructure.
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 O.C. Fisher Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Red Arroyo At S. Chadbourne St. Nr San Angelo | 2 cfs | → |
| Concho Rv At San Angelo | 8 cfs | → |
| North Concho Rv Nr Grape Creek | · | → |
| N Concho Rv Nr Carlsbad | · | → |
| Pecan Ck Nr San Angelo | · | → |
| Spring Ck Abv Twin Buttes Res Nr San Angelo | · | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near O.C. Fisher Dam.
Track O.C. Fisher 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 O.C. Fisher Dam
Where does the data for O.C. Fisher 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 O.C. Fisher Dam.