Misteguay Creek 2a Reservoir Report

Last Updated: December 5, 2025

Misteguay Creek 2a, also known as the Allen Road Dam, is a privately owned structure located in New Lothrop, Michigan.


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Summary

Built in 1966 by the USDA NRCS, this earth dam stands at a height of 29 feet and spans 1150 feet along Misteguay Creek. Its primary purpose is flood risk reduction, serving to protect the surrounding area from potential inundation during periods of high discharge.

Managed by the Michigan DEGLE, Misteguay Creek 2a is regulated, inspected, and enforced by state agencies to ensure its structural integrity and safety. With a low hazard potential and a satisfactory condition assessment as of September 2018, the dam poses a moderate risk level (3) according to risk assessments. While the dam currently does not have a designated Emergency Action Plan (EAP), it meets regulatory guidelines and has emergency contacts in place for any potential incidents.

Despite its low hazard potential, Misteguay Creek 2a plays a crucial role in mitigating flood risks in the area, with a maximum discharge capacity of 10,800 cubic feet per second. As a key component of water resource management in Shiawassee County, this dam stands as a testament to the importance of maintaining infrastructure to protect against the impacts of climate change and extreme weather events in the region.

Year Completed

1966

Dam Length

1150

Dam Height

29

River Or Stream

Misteguay Creek

Primary Dam Type

Earth

Hydraulic Height

29

Drainage Area

53.5

Nid Storage

3517

Structural Height

29

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

29
       
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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.