Spring Ridge Swm Pond No. 4a Reservoir Report

Last Updated: December 5, 2025

Spring Ridge Swm Pond No.


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Summary

4a, located in Frederick, Maryland, serves as a private flood risk reduction structure along the Lower Monocacy River. Completed in 1994, this earth dam stands at a height of 16 feet and has a storage capacity of 50 acre-feet, with a normal storage level of 5.8 feet. The dam spans 400 feet in length and covers a surface area of 1.16 acres, providing vital protection to the surrounding area from potential flooding events.

Managed by the Maryland Dam Safety regulatory agency, Spring Ridge Swm Pond No. 4a is classified as having a low hazard potential and a moderate risk level. Although the structure has not been rated for its condition, it undergoes periodic inspections every five years to ensure its continued effectiveness in flood risk reduction. With an uncontrolled spillway and needle outlet gates, this pond plays a crucial role in mitigating flood risks and safeguarding the local community in Spring Ridge during extreme weather events.

As a key component of the flood risk reduction infrastructure in the region, Spring Ridge Swm Pond No. 4a remains an essential resource for water resource and climate enthusiasts. With its strategic location and design features, this pond exemplifies the importance of proactive measures in managing water resources and addressing the challenges posed by climate variability. Its capacity to hold and release water effectively underscores the critical role that sustainable water management practices play in enhancing community resilience to climate-related risks.

Year Completed

1994

Dam Length

400

Dam Height

16

River Or Stream

Lower Monocacy-TR-Linganore Cr

Primary Dam Type

Earth

Surface Area

1.16

Drainage Area

0.07

Nid Storage

50

Outlet Gates

Needle - 0

Hazard Potential

Low

Foundations

Soil

Nid Height

16
       
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.