Big Seven Lake Dam
Big Seven Lake Dam is an earth dam located in Oakland County, Michigan, built in 1967. It carries a Low hazard potential classification and has a fair condition assessment.
About Big Seven Lake Dam
The primary purpose of Big Seven 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 Swartz Creek near Swartz Creek.
The dam stands 15 feet tall and stretches 220 feet across, creates a reservoir covering 161 acres, has a maximum storage capacity of 1,240 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1967, 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 10/28/2019.
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Location
| State | Michigan |
| County | Oakland |
| Nearest City | Swartz Creek |
| River/Stream | Tributary To Swartz Creek |
| Coordinates | 42.81951, -83.67960 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 220 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 1,240 acre-ft |
| Max Storage | 1,240 acre-ft |
| Normal Storage | 680 acre-ft |
| Surface Area | 161 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 840 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MDNR Parks & Recreation |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/28/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00432 |
| Federal ID | MI00432 |
| More Info | State Dam Safety Program |