Pratt Pond Dam Reservoir Report

Last Updated: December 17, 2025

Pratt Pond Dam, located in Mason, New Hampshire, is a state-regulated structure designed for recreational purposes.


°F

°F

mph

Wind

%

Humidity

Summary

The dam is classified as an earth dam with a height of 6.2 feet and a length of 140 feet. Completed in 1935, it has a storage capacity of 200 acre-feet and covers a surface area of 34 acres. The dam is situated on TR Mitchell Brook and is managed by the NHDES Dam Bureau.

Despite being categorized as having a low hazard potential, the dam has a moderate risk assessment of 3. It is not currently rated for its condition, and the last inspection was conducted in July 2015. The emergency action plan status, inundation maps, and risk management measures for Pratt Pond Dam are not readily available in the data provided. Water resource and climate enthusiasts may find Pratt Pond Dam an intriguing case study for examining the regulatory oversight and risk assessment of recreational dams in New Hampshire.

Water resource enthusiasts may be interested in further exploring the environmental impact and hydrological significance of Pratt Pond Dam within the context of the local Hillsborough County watershed. The dam, with its uncontrolled spillway type and earth construction, presents a unique opportunity to study the interactions between human-made structures and natural water systems. Understanding the management and maintenance practices of Pratt Pond Dam can provide valuable insights into sustainable water resource management strategies for similar recreational dams in the region.

Year Completed

1935

Dam Length

140

Dam Height

6.2

River Or Stream

TR MITCHELL BROOK

Primary Dam Type

Earth

Surface Area

34

Drainage Area

0.9

Nid Storage

200

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

6
       
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.