Superior Dam Reservoir Report

Last Updated: December 5, 2025

Superior Dam, located in Washtenaw County, Michigan, is a captivating structure with a rich history dating back to its completion in 1919.


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Summary

Owned by the local government, this earth and gravity dam stands at a height of 25 feet, with a hydraulic height of 16.5 feet and a structural height of 35 feet. Its primary purpose is hydroelectric power generation, with a storage capacity of 2,803 acre-feet and a normal storage level of 700 acre-feet.

The dam, situated on the Huron River, plays a crucial role in water resource management and flood control in the region. With a maximum discharge capacity of 17,200 cubic feet per second, a controlled spillway measuring 163 feet, and a hazard potential rated as high, Superior Dam is a key infrastructure for ensuring the safety and sustainability of the surrounding area. While the condition assessment is not currently available, the Federal Energy Regulatory Commission oversees its regulation and inspections.

Despite its age, Superior Dam continues to serve as a vital asset for the community, providing renewable energy and essential water management functions. With its impressive length of 496 feet and surface area of 103 acres, this dam represents a blend of engineering ingenuity and environmental stewardship. As water resource and climate enthusiasts, the significance of Superior Dam in the local ecosystem and its role in sustainable energy production make it a captivating site worth exploring and studying in-depth.

Year Completed

1919

Dam Length

496

Dam Height

25

River Or Stream

Huron River

Primary Dam Type

Earth

Surface Area

103

Hydraulic Height

16.5

Drainage Area

801

Nid Storage

2803

Structural Height

35

Outlet Gates

Tainter (radial) - 1

Hazard Potential

High

Foundations

Soil

Nid Height

35
       
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.