Portage Lake Dam
Portage Lake Dam is an earth dam located in Jackson County, Michigan, built in 1957. It carries a Low hazard potential classification and has a fair condition assessment.
About Portage Lake Dam
The primary purpose of Portage Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mdnr Parks & Recreation (state). It impounds the Tributary To Portage River near Henrietta Station.
The dam stands 8 feet tall and stretches 3,200 feet across, creates a reservoir covering 400 acres, has a maximum storage capacity of 6,500 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1957, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/22/2018.
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Location
| State | Michigan |
| County | Jackson |
| Nearest City | Henrietta Station |
| River/Stream | Tributary To Portage River |
| Coordinates | 42.34596, -84.25019 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 3,200 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 6,500 acre-ft |
| Max Storage | 6,500 acre-ft |
| Normal Storage | 5,000 acre-ft |
| Surface Area | 400 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 37 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MDNR Parks & Recreation |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/22/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00733 |
| Federal ID | MI00733 |
| More Info | State Dam Safety Program |