Gregory State Game Area Dam #3 Reservoir Report

Last Updated: December 5, 2025

Located in Pinckney, Michigan, Gregory State Game Area Dam #3, also known as Bently Lake Road Flooding, is a state-owned earth dam completed in 1965.


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Summary

This dam serves as a vital structure for regulating water flow in the tributary to Honey Creek, with a primary purpose designated as "Other." Standing at a structural height of 7.5 feet and a hydraulic height of 7.2 feet, the dam boasts a normal storage capacity of 90 acre-feet and a maximum storage of 160 acre-feet.

With a low hazard potential and fair condition assessment, Gregory State Game Area Dam #3 is inspected every five years by the Michigan Department of Environment, Great Lakes, and Energy (DEGLE). The dam features an uncontrolled spillway with a width of 182 feet, capable of discharging up to 300 cubic feet per second in times of high water levels. The dam's risk assessment is rated as moderate, emphasizing the importance of ongoing risk management measures to ensure the safety and functionality of the structure.

Enthusiasts of water resources and climate in Livingston County, Michigan, can appreciate Gregory State Game Area Dam #3 for its role in water regulation and flood control within the local ecosystem. As a key component of the state's infrastructure, this earth dam stands as a testament to the ongoing efforts to manage water resources effectively while balancing environmental concerns and public safety. With a rich history dating back to the mid-20th century, this dam continues to play a crucial role in the region's water management practices, under the watchful eye of regulatory agencies and emergency preparedness protocols.

Year Completed

1965

Dam Length

475

Dam Height

7.5

River Or Stream

Tributary to Honey Creek

Primary Dam Type

Earth

Surface Area

80

Hydraulic Height

7.2

Drainage Area

5

Nid Storage

160

Structural Height

7.5

Hazard Potential

Low

Nid Height

8
       
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.