Empire Mine Tertiary Pond Dam is an earth dam located in Marquette County, Michigan, built in 1975. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 90 ft90 ft tall and 850 ft long, taller than 97% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Empire Mine Tertiary Pond Dam
Empire Mine Tertiary Pond Dam is a dam in Marquette, Michigan. The dam is owned by Empire Iron Mining Partnership (private). It impounds the Green Creek near Gwinn.
The dam stands 90 feet tall and stretches 850 feet across, creates a reservoir covering 93 acres, has a maximum storage capacity of 3,348 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1975, 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/01/2016. That was over 10 years ago.
At 90 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | Michigan |
| County | Marquette |
| Nearest City | Gwinn |
| River/Stream | Green Creek |
| Coordinates | 46.38611, -87.62778 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 90 ft |
| Dam Height | 90 ft |
| Dam Length | 850 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 3,348 acre-ft |
| Max Storage | 3,348 acre-ft |
| Normal Storage | 3,348 acre-ft |
| Surface Area | 93 acres |
| Drainage Area | 5 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Other |
| Owner | Empire Iron Mining Partnership |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/01/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00101 |
| Federal ID | MI00101 |
| More Info | State Dam Safety Program |