Logan Martin
Logan Martin is a gravity dam located in St. Clair County, Alabama, built in 1964. It carries a High hazard potential classification and has a poor condition assessment.
About Logan Martin
The primary purpose of Logan Martin is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Alabama Power Company (public utility). It impounds the Coosa near Vincent.
The dam stands 142 feet tall and stretches 6,076 feet across, creates a reservoir covering 15,263 acres, has a maximum storage capacity of 650,000 acre-feet, and collects water from a drainage area of 7,700 square miles. Completed in 1964, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 05/05/2025.
At 142 feet, this dam is taller than 99% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Alabama dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Alabama |
| County | St. Clair |
| Nearest City | Vincent |
| River/Stream | Coosa |
| Coordinates | 33.42545, -86.33688 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 142 ft |
| Dam Height | 97 ft |
| Dam Length | 6,076 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 650,000 acre-ft |
| Max Storage | 650,000 acre-ft |
| Normal Storage | 273,000 acre-ft |
| Surface Area | 15,263 acres |
| Drainage Area | 7,700 sq mi |
| Max Discharge | 167,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Alabama Power Company |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 05/05/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | AL01417 |
| Federal ID | AL01417 |
| More Info | State Dam Safety Program |