Flook Dam Reservoir Report

Last Updated: December 5, 2025

Located in Dexter, Michigan, along the Huron River, Flook Dam serves as a significant earth and gravity dam with a height of 11.8 feet and a length of 400 feet.


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Summary

Completed in 1965, this private dam provides a storage capacity of 6,000 acre-feet and plays a crucial role in managing water resources in the area. With a spillway width of 106 feet and a controlled spillway type, Flook Dam is designed to handle maximum discharges of up to 7,880 cubic feet per second, ensuring effective flood control measures for the surrounding region.

Managed by the Michigan Department of Environment, Great Lakes, and Energy (DEGLE), Flook Dam has a state-regulated status with regular inspections to maintain its satisfactory condition and significant hazard potential. The dam's risk assessment indicates a very high risk level, requiring stringent risk management measures to ensure its operational safety and reliability. Despite being a private structure, Flook Dam's importance in water resource management and climate adaptation efforts cannot be understated, making it a key asset in the overall infrastructure of the region.

With its strategic location and vital role in water storage and flood control, Flook Dam stands as a critical asset along the Huron River, contributing to the overall resilience of the local water infrastructure. As climate change continues to pose challenges to water resources and extreme weather events become more frequent, the effective management and maintenance of dams like Flook Dam are essential for ensuring the safety and sustainability of communities in Washtenaw County and beyond. The dam's regulated status, state inspections, and emergency action plans underscore the commitment to safeguarding the surrounding areas from potential risks and ensuring the efficient utilization of water resources for future generations.

Year Completed

1965

Dam Length

400

Dam Height

11.8

River Or Stream

Huron River

Primary Dam Type

Earth

Surface Area

769

Hydraulic Height

9.7

Drainage Area

534

Nid Storage

6000

Structural Height

11.8

Hazard Potential

Significant

Nid Height

12
       
Seasonal Comparison

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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.