Tullamore Dam Reservoir Report

Last Updated: December 5, 2025

Tullamore Dam, also known as Lake Tullamore, is a vital water resource infrastructure located in Mundelin, Illinois.


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Summary

Constructed in 1994 by designer REZEK, HENRY, MEISENHEIMER & GENDE, this earth dam serves the primary purpose of flood risk reduction along the Seavey Drainage Ditch. With a height of 17 feet and a storage capacity of 106 acre-feet, Tullamore Dam plays a crucial role in managing water flow and protecting the surrounding areas from potential flooding events.

Managed by the local government and regulated by the Illinois Department of Natural Resources, Tullamore Dam is equipped with an uncontrolled spillway and has a hazard potential classified as high. The dam underwent its last inspection in September 2019, with an inspection frequency of once per year. Despite the lack of available condition assessment data, the risk assessment for Tullamore Dam is moderate (3), highlighting the importance of continued monitoring and maintenance to ensure its structural integrity and effectiveness in mitigating flood risks.

As a key component of the flood risk reduction system in Lake County, Illinois, Tullamore Dam plays a significant role in protecting the community and infrastructure from potential water-related disasters. With its strategic location and design features, this essential water resource structure stands as a testament to effective flood management practices and serves as a critical asset for climate resilience in the region.

Year Completed

1994

Dam Length

600

Dam Height

17

River Or Stream

SEAVEY DRAINAGE DITCH

Primary Dam Type

Earth

Nid Storage

106

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

17
       
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.