Midland-Gilmore Reservoir Reservoir Report

Last Updated: December 5, 2025

Midland-Gilmore Reservoir, also known as Lonaconing Water Treatment Plant No.


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Summary

3, is a vital water supply source located in Allegany, Maryland. Built in 1903, this earth dam stands at a height of 19 feet and has a storage capacity of 16 acre-feet. The reservoir covers a surface area of 1.3 acres and is fed by Elk Lick Run, serving as a crucial resource for the community of Charlestown.

Despite its historical significance and essential role in water supply, Midland-Gilmore Reservoir faces challenges in terms of its condition assessment, which has been rated as poor. With a high hazard potential, the dam requires regular inspections and maintenance to ensure the safety of surrounding areas in the event of an emergency. Although the risk assessment currently stands at a moderate level, there is a need for proactive risk management measures to be implemented to safeguard the reservoir and its downstream communities.

As a key water infrastructure managed by the local government, Midland-Gilmore Reservoir is subject to state regulation and inspection by the Maryland Dam Safety agency. With a spillway width of 45 feet and a maximum discharge capacity of 135 cfs, this reservoir plays a crucial role in water resource management in the region. Despite its challenges, efforts are being made to address the dam's maintenance needs and ensure its continued functionality for the benefit of the community it serves.

Years Modified

1990 - Other

Year Completed

1903

Dam Length

229

Dam Height

19

River Or Stream

Elk Lick Run

Primary Dam Type

Earth

Surface Area

1.3

Drainage Area

2.2

Nid Storage

16

Outlet Gates

Valve - 0

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

19
       
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.