Mann Lake Dam Reservoir Report
Nearby: Haynes Lake Dam Lake Creek Dam
Last Updated: December 22, 2025
Mann Lake Dam, located in Falls County, Texas, was completed in 1957 and serves as a vital structure on the Brazos River.
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Summary
This privately owned earth dam stands at a height of 16 feet and has a length of 720 feet, providing a storage capacity of 108 acre-feet. With a spillway width of 86 feet and uncontrolled spillway type, the dam is designed to manage a maximum discharge of 1495 cubic feet per second.
Despite being privately owned, Mann Lake Dam is regulated and inspected by the state of Texas, with permitting and inspection processes in place to ensure its safety and compliance with regulations. The dam's hazard potential is deemed to be not available, with a moderate risk assessment rating of 3. Emergency action plans have been prepared, updated, and reviewed, indicating a proactive approach to risk management and public safety in the event of emergencies.
Water resource and climate enthusiasts will find Mann Lake Dam to be an interesting structure, with its unique design features and important role in managing water flow and storage on the Brazos River. The dam's historical significance, construction details, and risk management measures make it a fascinating subject for those interested in sustainable water resource management and infrastructure development in Texas.
Year Completed |
1957 |
Dam Length |
720 |
Dam Height |
16 |
River Or Stream |
BRAZOS RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Nid Storage |
108 |
Structural Height |
16 |
Outlet Gates |
Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Brazos Rv At Waco
|
98cfs |
Brazos Rv Nr Highbank
|
205cfs |
Middle Bosque Rv Nr Mcgregor
|
11cfs |
Hog Ck Nr Crawford
|
3cfs |
Little Pond Ck Nr Burlington
|
0cfs |
Navasota Rv Abv Groesbeck
|
2cfs |
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.
Mann Lake Dam