Peas Lake Dam Reservoir Report
Nearby: Schafer Dam Harris Dam
Last Updated: December 5, 2025
Peas Lake Dam, located in Mount Pleasant, Michigan, is a privately owned structure built in 1961 for recreational purposes.
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Summary
This earth dam stands at a height of 18 feet and spans 150 feet in length, providing a storage capacity of 165 acre-feet. Situated on Johnson Creek, the dam serves as a popular spot for outdoor activities, with a surface area of 10 acres for visitors to enjoy.
Although deemed to have a low hazard potential and fair condition, Peas Lake Dam is subject to inspections every five years to ensure its safety and functionality. The dam features an uncontrolled spillway with a width of 2 feet and a maximum discharge capacity of 25 cubic feet per second. With the surrounding area having a drainage area of 0.68 square miles, the dam plays a crucial role in managing water resources in the region.
Even with its moderate risk assessment, Peas Lake Dam remains a vital part of the local ecosystem and recreation opportunities. Owned by a private entity, the dam continues to be regulated and inspected by the Michigan Department of Environment, Great Lakes, and Energy (DEGLE) to uphold its operational standards and ensure the safety of those who visit the area.
Year Completed |
1961 |
Dam Length |
150 |
Dam Height |
18 |
River Or Stream |
Johnson Creek |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
18 |
Drainage Area |
0.68 |
Nid Storage |
165 |
Structural Height |
18 |
Hazard Potential |
Low |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Peas Lake Dam