Coates Estate Lake No 1 Dam Reservoir Report
Nearby: Coates Estate Lake No 2 Dam Story Dam
Last Updated: December 5, 2025
Coates Estate Lake No 1 Dam, located in Wilson County, Texas, is a private earth dam constructed in 1961 with a primary purpose of "Other." With a dam height of 15 feet and a length of 800 feet, the dam provides a storage capacity of 144 acre-feet and covers a surface area of 12 acres.
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Summary
The dam is situated on TR-Elm Creek and is not regulated by the state, although it undergoes regular inspections.
Despite being rated as "Not Rated" in terms of condition assessment, the dam is considered to have a high risk level (2) according to the hazard potential assessment. The dam does not have a spillway and is equipped with one outlet gate. The risk management measures and emergency preparedness plans for the dam remain unspecified, indicating a potential area for improvement in ensuring the safety and integrity of the structure for both the surrounding community and the environment.
Water resource and climate enthusiasts may find Coates Estate Lake No 1 Dam to be an intriguing case study for understanding the challenges and considerations involved in maintaining private dams in Texas. The dam's history, design features, and risk assessment provide valuable insights into the complexities of managing water resources, particularly in the context of changing climate patterns and increasing infrastructure vulnerabilities. Overall, the dam serves as a reminder of the importance of proactive monitoring, maintenance, and risk mitigation strategies to ensure the safety and resilience of water infrastructure in the face of evolving environmental conditions.
Year Completed |
1961 |
Dam Length |
800 |
Dam Height |
15 |
River Or Stream |
TR-ELM CREEK |
Primary Dam Type |
Earth |
Surface Area |
12 |
Hydraulic Height |
15 |
Nid Storage |
144 |
Structural Height |
15 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Cibolo Ck At Sutherland Springs
|
20cfs |
Cibolo Ck Nr Falls City
|
33cfs |
Ecleto Ck Nr Runge
|
0cfs |
Guadalupe Rv At Fm 1117 Nr Seguin
|
108cfs |
Sandies Ck Nr Westhoff
|
0cfs |
Guadalupe Rv At Cr 143 Nr Gonzales
|
125cfs |
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.
Coates Estate Lake No 1 Dam