Bwi Pond B12 Reservoir Report

Last Updated: December 5, 2025

Bwi Pond B12, located in Glen Burnie, Maryland, is a privately owned earth dam completed in 1995 for flood risk reduction along Sawmill Creek-TR.


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Summary

With a height of 21 feet and a length of 835 feet, the dam has a storage capacity of 81.84 acre-feet and covers a surface area of 6.75 acres within a drainage area of 0.41 square miles. The dam's spillway type is uncontrolled, with a width of 20 feet, and it has been classified as having a significant hazard potential.

Despite its vital role in flood risk reduction, Bwi Pond B12 has been assessed as being in poor condition, with a last inspection in December 2018. The dam's hazard potential is considered significant, with a moderate risk assessment rating of 3. The emergency action plan for the dam was last revised in May 2021, indicating a need for ongoing monitoring and maintenance to ensure the safety and effectiveness of this critical infrastructure. For water resource and climate enthusiasts, Bwi Pond B12 presents an intriguing case study in dam safety and management in the face of changing environmental conditions.

Year Completed

1995

Dam Length

835

Dam Height

21

River Or Stream

Sawmill Creek-TR

Primary Dam Type

Earth

Surface Area

6.75

Drainage Area

0.41

Nid Storage

81.84

Outlet Gates

Uncontrolled - 0

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

21
       
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.