Watson Reservoir Report

Last Updated: December 16, 2025

Watson, also known as Waldron Dam, is a private hydroelectric structure located in Dover, New Hampshire on the Cocheco River.


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Summary

Constructed in 1900, this concrete gravity dam stands at a height of 12 feet with a length of 290 feet, providing a storage capacity of 236 acre-feet. Managed by the New Hampshire Department of Environmental Services Dam Bureau, Watson is regulated by both state and federal agencies, with inspections conducted by the Federal Energy Regulatory Commission.

With a low hazard potential and moderate risk assessment, Watson plays a crucial role in providing hydroelectric power to the region. The dam is equipped with an uncontrolled spillway, measuring 240 feet in width, and has a maximum discharge capacity of 9170 cubic feet per second. While the condition assessment is not currently available, regular inspections are conducted to ensure the safety and integrity of the structure. In the event of an emergency, the dam operators are prepared to follow established guidelines for effective risk management.

Overall, Watson Dam serves as a significant water resource and climate asset in the region, contributing to the sustainable production of hydroelectric power. With its historical significance and strategic location on the Cocheco River, Watson represents a key piece of infrastructure that plays a vital role in meeting the energy needs of the community while adhering to strict regulatory standards for safety and environmental protection.

Year Completed

1900

Dam Length

290

Dam Height

12

River Or Stream

Cocheco River

Primary Dam Type

Concrete

Surface Area

54

Drainage Area

180

Nid Storage

236

Hazard Potential

Low

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.