Guilford Reservoir Storage Tanks Reservoir Report

Last Updated: December 5, 2025

The Guilford Reservoir Storage Tanks in Baltimore City, Maryland, were completed in 1893 and serve as a vital water supply source for the area.


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Summary

Managed by the local government, these tanks have a primary purpose of water supply and are regulated by the Maryland Dam Safety agency. With a normal storage capacity of 104 acre-feet and a maximum storage capacity of 134 acre-feet, the reservoirs play a crucial role in ensuring a stable water supply for the surrounding community.

Constructed with a core type of Multi-Arch and built on a foundation of rock and soil, the Guilford Reservoir Storage Tanks stand at a height of 35 feet with a length of 2375 feet. Despite being classified as a high hazard potential structure, the condition assessment has deemed them to be satisfactory. Regular inspections and maintenance ensure the safety and reliability of these storage tanks, which have no spillway and utilize needle outlet gates for water release. As climate change impacts water resources, the Guilford Reservoir Storage Tanks remain a critical infrastructure for water management in the region.

Located near the Offstream-Stoney Run water source, the Guilford Reservoir Storage Tanks play a crucial role in the water supply system of Baltimore City. With a high risk assessment rating of 2, it is essential for local authorities to continue monitoring and implementing risk management measures to ensure the resilience of this key infrastructure. As water resource and climate enthusiasts, understanding the importance of such structures in maintaining water security and adapting to changing environmental conditions is paramount for sustainable water management practices.

Year Completed

1893

Dam Length

2375

Dam Height

35

River Or Stream

Offstream-Stoney Run

Primary Dam Type

Other

Surface Area

7

Drainage Area

0.01

Nid Storage

134

Outlet Gates

Needle - 0

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

35
       
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.