Wildlife Flooding Dam Reservoir Report

Last Updated: December 5, 2025

Wildlife Flooding Dam, also known as Old Rr Grade Dam, is a state-owned structure located in Pinckney, Michigan.


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Summary

Completed in 1890, this earth dam stands at a height of 8 feet and spans a length of 500 feet, with a primary purpose of recreation. Situated on a tributary to Honey Creek, the dam provides a surface area of 18 acres and has a normal storage capacity of 25 acre-feet.

Despite being categorized as low hazard potential, Wildlife Flooding Dam poses a moderate risk due to its condition assessment being "Not Rated." The dam features an uncontrolled spillway type with a width of 1 foot, and it has not undergone any modifications in recent years. The last inspection in 2015 revealed no major concerns, but the structure is subject to a 5-year inspection frequency to ensure its safety and integrity for recreational use.

The dam, managed by the state of Michigan, does not fall under federal jurisdiction and is not regulated by state agencies. While it serves as a recreational site for the local community, the overall risk assessment indicates a moderate level of concern. With its historical significance dating back over a century, efforts to maintain and monitor Wildlife Flooding Dam are essential to ensure the safety of both wildlife and visitors in the area.

Year Completed

1890

Dam Length

500

Dam Height

8

River Or Stream

Tributary to Honey Creek

Primary Dam Type

Earth

Surface Area

18

Hydraulic Height

6

Drainage Area

0.1

Nid Storage

60

Structural Height

8

Hazard Potential

Low

Nid Height

8
       
Seasonal Comparison

Weather Forecast

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.