Lake Sealy Dam Reservoir Report
Last Updated: December 5, 2025
Lake Sealy Dam, located in Coleman, Texas, was completed in 1910 and stands at a height of 21.7 feet.
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Summary
Designed by Hawley and Freese and Nichols, this earth dam on Mud Creek serves primarily for recreation purposes, offering a serene retreat for water and climate enthusiasts. With a storage capacity of 800 acre-feet, the dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and has undergone state inspections and enforcement to ensure its safety and compliance.
Despite its historical significance, Lake Sealy Dam has been assessed to be in poor condition as of December 2016, indicating a need for maintenance and potential upgrades. The spillway, with a width of 155 feet, is uncontrolled, and the dam features one uncontrolled and one valve outlet gate. While the hazard potential is not available, the risk assessment is classified as moderate, highlighting the importance of ongoing monitoring and management measures to mitigate any potential risks associated with the dam. As a popular recreational spot in the area, Lake Sealy Dam serves as a vital water resource for the community, emphasizing the need for continued vigilance and maintenance to ensure its long-term sustainability and safety.
Year Completed |
1910 |
Dam Length |
1155 |
Dam Height |
21.7 |
River Or Stream |
MUD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
21.7 |
Nid Storage |
800 |
Structural Height |
21.7 |
Outlet Gates |
Uncontrolled - 1, Valve - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Jim Ned Ck At Cr 140 Nr Coleman
|
0cfs |
Hords Ck Nr Coleman
|
0cfs |
Pecan Bayou Nr Cross Cut
|
436cfs |
Colorado Rv Nr Stacy
|
1cfs |
Pecan Bayou Nr Mullin
|
2cfs |
Elm Ck At Ballinger
|
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.
Lake Sealy Dam