Koa Lake Dam Reservoir Report
Nearby: Hargus Dam Cohenour Reservoir
Last Updated: December 6, 2025
Koa Lake Dam, located in La Salle, Texas, was completed in 1971 and stands at a height of 10 feet with a length of 882 feet.
°F
°F
mph
Wind
%
Humidity
Summary
This earth dam, primarily used for recreation and water supply, sits on the TR-Nueces River and has a storage capacity of 122 acre-feet. With a surface area of 14 acres and a drainage area of 1.72 square miles, Koa Lake Dam plays a crucial role in water resource management in the region.
The dam features an uncontrolled spillway with a width of 140 feet, and two uncontrolled outlet gates. Despite being privately owned, the dam is subject to state inspection and permitting processes. It is not regulated by the state and has not been rated for its condition, though it is considered to have a moderate risk level. Koa Lake Dam provides not only recreational opportunities but also contributes to water supply needs in the area, making it an important structure for both residents and the environment.
For water resource and climate enthusiasts, Koa Lake Dam is a fascinating example of how dams can serve multiple purposes, from recreation to water supply. Its location on the TR-Nueces River and its moderate risk level highlight the importance of proper maintenance and monitoring of such infrastructure in ensuring the safety and sustainability of water resources in the region. With its history dating back to 1971, Koa Lake Dam continues to play a vital role in managing water flow and storage in La Salle, Texas.
Year Completed |
1971 |
Dam Length |
882 |
Dam Height |
10 |
River Or Stream |
TR-NUECES RIVER |
Primary Dam Type |
Earth |
Surface Area |
14 |
Hydraulic Height |
10 |
Drainage Area |
1.72 |
Nid Storage |
122 |
Structural Height |
10 |
Outlet Gates |
Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nueces Rv At Cotulla
|
0cfs |
Frio Rv Nr Derby
|
0cfs |
Nueces Rv Nr Asherton
|
0cfs |
San Casimiro Ck Nr Freer
|
0cfs |
Frio Rv At Tilden
|
0cfs |
Nueces Rv Nr Tilden
|
0cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
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. Investigations and studies are necessary.
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.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams 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, environment 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.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Koa Lake Dam