Michigan Limestone Tailings Dam
Michigan Limestone Tailings Dam is an earth dam located in Presque Isle County, Michigan, built in 1969. It carries a Low hazard potential classification.
About Michigan Limestone Tailings Dam
The primary purpose of Michigan Limestone Tailings Dam 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 O-n Minerals (private).
The dam stands 50 feet tall, creates a reservoir covering 340 acres, has a maximum storage capacity of 6,800 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1969, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 10/27/2020.
At 50 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Michigan |
| County | Presque Isle |
| Nearest City | None-lake Huron |
| Coordinates | 45.40170, -83.74874 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 50 ft |
| Dam Height | 50 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 6,800 acre-ft |
| Max Storage | 6,800 acre-ft |
| Normal Storage | 5,100 acre-ft |
| Surface Area | 340 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Tailings |
| Owner | O-N Minerals |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 10/27/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI02605 |
| Federal ID | MI02605 |
| More Info | State Dam Safety Program |