Greenville Dam Reservoir Report

Last Updated: December 5, 2025

The Greenville Dam, also known as the Franklin Street Dam, located in Greenville, Michigan, is a gravity dam built in 1914 on the Flat River.


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Summary

With a height of 14.1 feet and a length of 275 feet, this dam serves primarily for recreation purposes, providing a surface area of 149 acres and a normal storage capacity of 1500 acre-feet. The dam is under state regulation by the Michigan DEGLE, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulatory standards.

This significant dam has a spillway width of 50 feet and a maximum discharge capacity of 4720 cubic feet per second, with a hazard potential rated as significant. Despite its age, the dam's condition assessment in 2014 was deemed satisfactory, and it undergoes inspections every four years to monitor its structural integrity. With a very high risk rating of 1, the Greenville Dam is essential in managing water resources and providing recreational opportunities in the Montcalm County area. Water resource and climate enthusiasts will find this dam a key feature in understanding the local hydrology and environmental dynamics of the region.

Year Completed

1914

Dam Length

275

Dam Height

14.1

River Or Stream

Flat River

Primary Dam Type

Gravity

Surface Area

149

Hydraulic Height

14.1

Drainage Area

289

Nid Storage

3000

Structural Height

14.1

Hazard Potential

Significant

Nid Height

14
       
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.