Larrys Pond Dam Reservoir Report

Last Updated: January 2, 2026

Larrys Pond Dam, located in Richmond, New Hampshire, is a private-owned earth dam primarily used for recreation purposes.


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Summary

Built in 1970, the dam stands at a height of 18.5 feet and has a storage capacity of 100 acre-feet, with a normal storage level of 70 acre-feet. The dam is situated on TR Tully Brook and is regulated by the NHDES Dam Bureau.

Despite being classified as having low hazard potential, Larrys Pond Dam has a moderate risk rating of 3. The dam has not been rated for its condition assessment, but it undergoes inspections every 6 years with the last one conducted in December 2016. The dam does not have an Emergency Action Plan prepared, and its inundation maps and risk management measures are not specified.

Overall, Larrys Pond Dam serves as a vital recreational resource in the area while also embodying a moderate level of risk due to its condition and lack of certain emergency preparedness measures. As climate change continues to impact water resources, ensuring the safety and maintenance of dams like Larrys Pond Dam becomes increasingly important for water resource and climate enthusiasts.

Year Completed

1970

Dam Length

440

Dam Height

18.5

River Or Stream

TR TULLY BROOK

Primary Dam Type

Earth

Surface Area

12

Drainage Area

0.63

Nid Storage

100

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

19
       
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.