Mann Lake Dam is an earth dam located in Falls County, Texas, built in 1957. It carries a Significant hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 720 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Mann Lake Dam
Mann Lake Dam is a dam in Falls, Texas. The dam is owned by Dale Haynes (private). It impounds the Brazos River.
The dam stands 16 feet tall and stretches 720 feet across, and has a maximum storage capacity of 108 acre-feet. Completed in 1957, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 07/22/2009. That was over 17 years ago.
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Location
| State | Texas |
| County | Falls |
| River/Stream | Brazos River |
| Coordinates | 31.43145, -96.96982 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 720 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 108 acre-ft |
| Max Storage | 108 acre-ft |
| Normal Storage | 47 acre-ft |
| Max Discharge | 1,495 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Dale Haynes |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/22/2009 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX05067 |
| Federal ID | TX05067 |
| More Info | State Dam Safety Program |