Washago Pond Dam Reservoir Report

Last Updated: December 5, 2025

Washago Pond Dam, located in Flat Rock, Michigan, was completed in 1979 primarily for recreational purposes.


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Summary

This earth dam stands at 16 feet high with a hydraulic height of 14.1 feet, serving as a crucial structure along the Regan Drain. With a storage capacity of 70 acre-feet, this dam covers a surface area of 14 acres and has a maximum discharge of 400 cubic feet per second.

Despite being classified as having a low hazard potential and fair condition assessment, Washago Pond Dam is regulated by the Michigan DEGLE. Regular state inspections, permitting, and enforcement ensure its safety and compliance with regulatory standards. The dam's uncontrolled spillway, 28 feet wide, helps manage water flow, maintaining the stability of the structure and mitigating potential risks.

Overall, Washago Pond Dam plays a vital role in providing recreational opportunities while also contributing to water resource management in Wayne County, Michigan. With its moderate risk assessment and ongoing state oversight, this dam continues to serve its purpose effectively, safeguarding the surrounding environment and communities.

Year Completed

1979

Dam Length

250

Dam Height

16

River Or Stream

Regan Drain

Primary Dam Type

Earth

Surface Area

14

Hydraulic Height

14.1

Drainage Area

2

Nid Storage

70

Structural Height

16

Hazard Potential

Low

Nid Height

16
       
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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.