Clay-boswell
Clay-boswell is an earth dam located in Itasca County, Minnesota. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Clay-boswell
The primary purpose of Clay-boswell is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by Mn Power And Light (public utility). It impounds the Mississippi River-tr near Grand Rapids.
The dam stands 50 feet tall and stretches 20,000 feet across, creates a reservoir covering 464 acres, has a maximum storage capacity of 8,250 acre-feet, and collects water from a drainage area of 0 square miles.
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. 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 10/04/2022.
At 50 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Minnesota |
| County | Itasca |
| Nearest City | Grand Rapids |
| River/Stream | Mississippi River-tr |
| Coordinates | 47.26197, -93.67133 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 50 ft |
| Dam Height | 50 ft |
| Dam Length | 20,000 ft |
Storage & Hydraulics
| NID Storage | 8,250 acre-ft |
| Max Storage | 8,250 acre-ft |
| Normal Storage | 2,500 acre-ft |
| Surface Area | 464 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Tailings |
| Owner | MN Power and Light |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/04/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MN01498 |
| Federal ID | MN01498 |
| More Info | State Dam Safety Program |