Five Channels Reservoir Report

Last Updated: December 5, 2025

Five Channels, a hydroelectric dam located on the Au Sable River in Oscoda, Michigan, stands as a feat of engineering dating back to its completion in 1912.


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Summary

With a height of 40 feet and a structural height of 41.8 feet, this gravity dam serves multiple purposes including hydroelectric power generation and recreation. Managed by the Federal Energy Regulatory Commission, Five Channels boasts a controlled spillway with a width of 72 feet and three Tainter (radial) outlet gates.

The dam's hazard potential is classified as high, with a very high risk assessment rating. Despite its age, the condition assessment of Five Channels is not available, highlighting the need for ongoing monitoring and maintenance. Emergency action plans have been prepared and updated periodically, with the last revision dating back to October 2019. The dam's location within a scenic area in Iosco County adds to its significance as a key water resource and climate feature in the region.

Water resource and climate enthusiasts will find Five Channels to be a captivating example of early 20th-century hydroelectric infrastructure. Its role in providing renewable energy and recreational opportunities along the Au Sable River underscores the importance of balancing human needs with environmental sustainability. As one of Michigan's historic dams, Five Channels serves as a reminder of the interconnected relationship between water resources, climate, and human development.

Year Completed

1912

Dam Length

800

Dam Height

40

River Or Stream

Au Sable River

Primary Dam Type

Gravity

Hydraulic Height

36.2

Drainage Area

1613

Nid Storage

3419

Structural Height

41.8

Outlet Gates

Tainter (radial) - 3

Hazard Potential

High

Foundations

Soil

Nid Height

42
       
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.