Rotman Dam Reservoir Report

Last Updated: December 5, 2025

Rotman Dam, also known as Rotman Lake Dam, is a privately owned structure located in Hamilton, Michigan, specifically in Allegan County.


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Summary

Completed in 2008, this earth-type dam stands at a height of 26 feet and has a hydraulic height of 25 feet, serving primarily for recreational purposes. With a storage capacity of 110 acre-feet, the dam sits on a tributary to the Little Rabbit River, covering a surface area of 11 acres and draining a small area of 0.06 square miles.

Despite its low hazard potential and satisfactory condition assessment, Rotman Dam is subject to regular state regulation, inspection, and enforcement by the Michigan Department of Environment, Great Lakes, and Energy (DEGLE). The dam lacks a spillway but has a spillway width of 50 feet. In the event of an emergency, the dam's risk assessment is considered high, with a DSAC assigned date yet to be determined. The structure has no association with the US Army Corps of Engineers and has not undergone any modifications since its completion.

Overall, Rotman Dam stands as a vital recreational asset in the area, providing a serene environment for outdoor activities and water-related leisure. Its construction and management adhere to state regulatory standards, ensuring the safety and enjoyment of visitors to Rotman Lake. As a key feature in the local landscape, the dam contributes to the conservation and utilization of water resources while offering a picturesque setting for climate enthusiasts to appreciate and explore.

Year Completed

2008

Dam Length

800

Dam Height

26

River Or Stream

Trib to Little Rabbit River

Primary Dam Type

Earth

Surface Area

11

Hydraulic Height

25

Drainage Area

0.06

Nid Storage

110

Structural Height

26

Hazard Potential

Low

Nid Height

26
       
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.