Logan First Dam
Logan First Dam is a buttress dam located in Cache County, Utah, built in 1914. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Logan First Dam
The primary purpose of Logan First Dam 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 Utah State University (local government). It impounds the Logan River near Logan.
The dam stands 30 feet tall and stretches 216 feet across, has a maximum storage capacity of 140 acre-feet, and collects water from a drainage area of 226 square miles. Completed in 1914, the structure is over a century 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 06/08/2023.
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 Utah 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 | Utah |
| County | Cache |
| Nearest City | Logan |
| River/Stream | Logan River |
| Coordinates | 41.74271, -111.79141 |
Physical Characteristics
| Dam Type | Buttress |
| NID Height | 30 ft |
| Dam Length | 216 ft |
| Year Completed | 1914 (112 years old) |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
| Normal Storage | 70 acre-ft |
| Drainage Area | 226 sq mi |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | UTAH STATE UNIVERSITY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/08/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00380 |
| Federal ID | UT00380 |
| More Info | State Dam Safety Program |