Allegan is a gravity dam located in Allegan County, Michigan, built in 1936. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 30 ft30 ft tall and 1,335 ft long, taller than 68% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Allegan
The primary purpose of Allegan is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Consumers Energy Company (public utility). It impounds the Kalamazoo River near New Richmond.
The dam stands 30 feet tall and stretches 1,335 feet across, creates a reservoir covering 1,600 acres, has a maximum storage capacity of 20,640 acre-feet, and collects water from a drainage area of 1,550 square miles. Completed in 1936, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 09/18/2017.
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Location
| State | Michigan |
| County | Allegan |
| Nearest City | New Richmond |
| River/Stream | Kalamazoo River |
| Coordinates | 42.56380, -85.95380 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 1,335 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 20,640 acre-ft |
| Max Storage | 20,640 acre-ft |
| Normal Storage | 17,200 acre-ft |
| Surface Area | 1,600 acres |
| Drainage Area | 1,550 sq mi |
| Max Discharge | 19,200 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Consumers Energy Company |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/18/2017 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MI00151 |
| Federal ID | MI00151 |
| More Info | State Dam Safety Program |