Flat River Diversion Dam Reservoir Report

Last Updated: December 5, 2025

The Flat River Diversion Dam in Kent, Michigan, is a gravity dam with a primary purpose of hydroelectric power generation.


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Summary

Completed in 1903, this structure stands at a height of 34 feet and has a hydraulic height of 22 feet. With a storage capacity of 3,500 acre-feet and a normal storage level of 2,380 acre-feet, the dam plays a crucial role in managing water resources in the area.

The dam also serves recreational purposes and has a spillway type of controlled with a width of 61 feet. The maximum discharge capacity of the dam is 14,565 cubic feet per second, making it an important component of the local water infrastructure. Despite its age, the dam has a high hazard potential and a very high risk assessment rating, emphasizing the need for regular inspections and maintenance to ensure its continued safe operation.

Owned by a private entity and regulated by the Federal Energy Regulatory Commission, the Flat River Diversion Dam is a key feature in the region's water management system. Its association with the Flat River and its role in providing hydroelectric power highlight its significance for water resource and climate enthusiasts interested in sustainable energy solutions and water infrastructure development.

Year Completed

1903

Dam Length

1050

Dam Height

34

River Or Stream

Flat River

Primary Dam Type

Gravity

Surface Area

216

Hydraulic Height

22

Drainage Area

568

Nid Storage

3500

Structural Height

34

Outlet Gates

Tainter (radial) - 2

Hazard Potential

High

Foundations

Rock

Nid Height

34
       
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.