Thompson Dam is an earth dam located in Isabella County, Michigan. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 13 ft13 ft tall and 280 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 Thompson Dam
The primary purpose of Thompson Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mr. John Mcconnell (private). It impounds the North Branch Chippewa River near Beal City.
The dam stands 13 feet tall and stretches 280 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 160 acre-feet, and collects water from a drainage area of 16 square miles.
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 09/13/2001. That was over 25 years ago.
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Location
| State | Michigan |
| County | Isabella |
| Nearest City | Beal City |
| River/Stream | North Branch Chippewa River |
| Coordinates | 43.76333, -84.86833 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 280 ft |
Storage & Hydraulics
| NID Storage | 160 acre-ft |
| Max Storage | 160 acre-ft |
| Normal Storage | 115 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 16 sq mi |
| Max Discharge | 495 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Mr. John Mcconnell |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 09/13/2001 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00788 |
| Federal ID | MI00788 |
| More Info | State Dam Safety Program |