Childs Bog Dam Reservoir Report

Last Updated: December 18, 2025

Childs Bog Dam in Harrisville, New Hampshire, is a state-regulated structure with a primary purpose of recreation.


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Summary

Completed in 1924, this earth dam stands at a height of 16.7 feet and has a storage capacity of 1327 acre-feet. The dam impounds the waters of TR MINNEWAWA BROOK, creating a surface area of 117 acres and serving as a recreational area for water resource and climate enthusiasts.

Despite its satisfactory condition assessment, Childs Bog Dam has a high hazard potential, indicating the importance of regular inspections and maintenance. With a spillway width of 157 feet and a maximum discharge of 3735 cubic feet per second, the dam plays a crucial role in managing water flow in the area. The risk assessment for this structure is moderate, highlighting the need for continued monitoring and risk management measures to ensure the safety of nearby communities and the environment.

Childs Bog Dam serves as a vital recreational and water management resource in Cheshire County, New Hampshire. Managed by the NHDES DAM BUREAU, this earth dam provides opportunities for outdoor activities while also requiring careful attention to its maintenance and safety protocols. As climate change impacts water resources, structures like Childs Bog Dam play a crucial role in adapting to changing conditions and mitigating potential risks for local communities and ecosystems.

Year Completed

1924

Dam Length

222

Dam Height

16.7

River Or Stream

TR MINNEWAWA BROOK

Primary Dam Type

Earth

Surface Area

117

Drainage Area

1.54

Nid Storage

1327

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

17
       
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.