Coon Brook Bog Dam Reservoir Report

Last Updated: December 11, 2025

Coon Brook Bog Dam, located in Pittsburg, New Hampshire, is a state-regulated structure managed by the NHDES Dam Bureau.


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Summary

Built in 1947, this earth dam stands at a height of 10 feet and spans 330 feet across Coon Brook, serving primarily for recreational purposes. With a storage capacity of 230 acre-feet and a surface area of 43 acres, the dam presents a low hazard potential but is currently assessed to be in poor condition, indicating a need for maintenance and rehabilitation.

Despite its moderate risk assessment rating, Coon Brook Bog Dam lacks a detailed emergency action plan and updated contact information, potentially posing a challenge in times of crisis. The dam's spillway type is listed as uncontrolled, with no outlet gates or locks specified. The structure's inspection frequency is every 6 years, with the last assessment conducted in August 2017, highlighting the importance of regular monitoring and maintenance to ensure its safety and functionality for both water resource management and climate enthusiasts who frequent the area.

As stakeholders continue to assess and address the dam's condition and risk management measures, there is an opportunity to enhance the structure's resilience and sustainability for the future. With proper maintenance and emergency preparedness, Coon Brook Bog Dam can continue to provide recreational benefits while safeguarding the surrounding environment and communities from potential hazards. Water resource and climate enthusiasts can play a vital role in advocating for the preservation and responsible management of this important infrastructure in Coos County, New Hampshire.

Year Completed

1947

Dam Length

330

Dam Height

10

River Or Stream

COON BROOK

Primary Dam Type

Earth

Surface Area

43

Drainage Area

1.4

Nid Storage

230

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

10
       
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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.