Seney J-1 Pool Dam is an earth dam located in Alger County, Michigan, built in 1940. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 7,865 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Seney J-1 Pool Dam
The primary purpose of Seney J-1 Pool Dam is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by US Fish and Wildlife Service (federal). It impounds the Holland Ditch.
The dam stands 10 feet tall and stretches 7,865 feet across, creates a reservoir covering 214 acres, has a maximum storage capacity of 1,496 acre-feet, and collects water from a drainage area of 39 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 07/16/2018.
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Location
| State | Michigan |
| County | Alger |
| River/Stream | Holland Ditch |
| Coordinates | 46.29028, -86.96583 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 7,865 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 1,496 acre-ft |
| Max Storage | 1,496 acre-ft |
| Normal Storage | 312 acre-ft |
| Surface Area | 214 acres |
| Drainage Area | 39 sq mi |
| Max Discharge | 4,898 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | US Fish and Wildlife Service |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 07/16/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00639 |
| Federal ID | MI00639 |
| More Info | State Dam Safety Program |