Thomson Dam No 3
Minnesota — Carlton County — St Louis River
Location
| State | Minnesota |
| County | Carlton |
| River | St Louis River |
| Coordinates | 46.66630, -92.40750 |
Physical Characteristics
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 1,322 ft |
| NID Storage | 4,352 acre-ft |
| Max Storage | 4,352 acre-ft |
| Surface Area | 375 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Satisfactory |
| EAP Status | Yes |
| Last Inspection | September 21, 2021 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1907 |
| Primary Purpose | Hydroelectric |
| Dam Type | Gravity |
| Owner Type | Private |
| Owner | Allete, Inc. |
| Other Name | Nos 2-3/4, 3, 3a, 4 and 4a |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.