Loch Raven Dam Reservoir Report

Last Updated: December 5, 2025

Loch Raven Dam, located in Loch Raven, Maryland, is a gravity dam on the Gunpowder River that serves as a crucial water supply source for the region.


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Summary

Completed in 1923, this impressive structure stands at a height of 130 feet and spans 623 feet in length. With a storage capacity of 145,000 acre-feet and a normal storage level of 72,700 acre-feet, Loch Raven Dam plays a vital role in providing water to the surrounding communities.

Managed by the local government and regulated by the Maryland Dam Safety agency, Loch Raven Dam has undergone modifications by Gannett Fleming to ensure its structural integrity. The dam is classified as having a high hazard potential, but its condition is assessed as satisfactory. Regular inspections and maintenance efforts contribute to the safe operation of the dam, with the most recent inspection conducted in July 2021. Despite its age, Loch Raven Dam continues to be a key component of the water resource infrastructure in the area, demonstrating a commitment to sustainable water management practices and climate resilience.

The dam's design includes a buttress core and is primarily constructed of rock foundations. Its uncontrolled spillway has a width of 288 feet, allowing for the release of excess water during periods of high flow. With a moderate risk assessment score of 3, Loch Raven Dam is subject to ongoing risk management measures to ensure the safety of downstream communities. As a significant player in water supply management and climate adaptation efforts, Loch Raven Dam stands as a testament to the importance of sustainable infrastructure in the face of changing environmental conditions.

Years Modified

2005 - Structural

Year Completed

1923

Dam Length

623

Dam Height

130

River Or Stream

Gunpowder River

Primary Dam Type

Gravity

Surface Area

2400

Drainage Area

303

Nid Storage

145000

Outlet Gates

Valve - 0

Hazard Potential

High

Foundations

Rock

Nid Height

130
       
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.