Town Mall Swm Pond Reservoir Report

Last Updated: December 5, 2025

Town Mall Swm Pond, also known as Cranberry Mall Swm Pond, is a privately owned structure located in Westminster, Maryland.


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Summary

This earth dam was completed in 1985 and serves primarily for flood risk reduction, with a height of 12 feet and a length of 500 feet. The pond has a storage capacity of 32 acre-feet, with a surface area of 2.3 acres and a maximum discharge of 296 cubic feet per second.

The dam is regulated by the Maryland Dam Safety agency, with state permitting, inspection, and enforcement in place. Despite its significant hazard potential, the dam is currently in poor condition as of the last assessment in April 2021. The structure has been modified for seismic events and is equipped with an uncontrolled spillway measuring 50 feet in width. With its proximity to Offstream-Longwell Run, Town Mall Swm Pond plays a crucial role in managing water resources and mitigating flood risks in the area.

As an essential infrastructure for flood risk reduction in Carroll County, Town Mall Swm Pond serves as a key component in the state's water resource management strategy. With its moderate risk assessment rating and poor condition, ongoing maintenance and potential rehabilitation efforts are necessary to ensure the safety and effectiveness of this vital water management structure. Climate and water resource enthusiasts can appreciate the intricate design and functionality of this earth dam, which plays a crucial role in protecting the local community from potential flooding events.

Years Modified

1985 - Seismic

Year Completed

1985

Dam Length

500

Dam Height

12

River Or Stream

Offstream-Longwell Run

Primary Dam Type

Earth

Surface Area

2.3

Hydraulic Height

9

Drainage Area

0.09

Nid Storage

32

Structural Height

10

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

12
       
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.