Pawtucket Lower Reservoir Report

Last Updated: December 6, 2025

Pawtucket Lower, also known as Bridge Mill Dam, is a historic masonry dam located in Pawtucket, Rhode Island, along the Blackstone River.


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Summary

Built in 1894, this dam serves a primary purpose of hydroelectric power generation, making it an important water resource in the area. With a height of 4 feet and a length of 200 feet, Pawtucket Lower has a storage capacity of 3 acre-feet and a maximum discharge of 1300 cubic feet per second.

Managed by a private owner and regulated by the Federal Energy Regulatory Commission, Pawtucket Lower poses a significant hazard potential due to its age and condition assessment being listed as "Not Available". The dam's spillway is uncontrolled with a width of 167 feet, indicating the need for proper maintenance and inspection. Despite its risk assessment being moderate, the dam's historical significance and contribution to the local hydroelectric power supply make it a notable site for water resource and climate enthusiasts to monitor and advocate for its preservation and safety.

As part of the New England District, Pawtucket Lower stands as a reminder of the region's industrial past and the importance of sustainable water management practices. With its unique design and location along the Blackstone River, this masonry dam continues to play a crucial role in the local ecosystem while offering insights into the intersection of water resources and climate resilience. It serves as a focal point for ongoing discussions on dam safety, emergency preparedness, and the balance between historical preservation and modern energy needs in Rhode Island.

Year Completed

1894

Dam Length

200

Dam Height

4

River Or Stream

Blackstone River

Primary Dam Type

Masonry

Surface Area

1

Drainage Area

478

Nid Storage

3

Hazard Potential

Significant

Foundations

Rock

Nid Height

4
       
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.