Alum Creek Upground Reservoir No. 2 Reservoir Report

Last Updated: December 5, 2025

Alum Creek Upground Reservoir No.


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Summary

2, also known as McNamara Reservoir, is a vital water supply facility located in Lewis Center, Ohio. Constructed in 2004 by BBC&M Engineering, Inc., this public utility reservoir plays a crucial role in providing water to the community. With a dam height of 36 feet and a storage capacity of 1912 acre-feet, this earth dam reservoir has a surface area of 52 acres and is regulated by the Department of Natural Resources in Ohio.

Situated off-stream from the Alum Creek river, this reservoir serves as a key source of water for the region, ensuring a reliable water supply for residents. Despite being classified as having a high hazard potential, the reservoir is in fair condition as of the last assessment in 2016. With regular inspections and enforcement measures in place, the facility is well-maintained to meet the water supply needs of the community.

Managed by the Louisville District of the US Army Corps of Engineers, Alum Creek Upground Reservoir No. 2 is an essential infrastructure for water resource management in Delaware County, Ohio. With a focus on water supply purposes, this reservoir continues to play a critical role in safeguarding water resources and supporting the local community's needs for a sustainable future.

Year Completed

2004

Dam Length

7140

Dam Height

36

River Or Stream

ALUM CREEK - OFF STREAM

Primary Dam Type

Earth

Surface Area

52

Nid Storage

1912

Hazard Potential

High

Nid Height

36
       
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.