Tyler Tree Farm Dam

Tyler Tree Farm Dam is an earth dam located in Grafton County, New Hampshire, built in 1969. It carries a Significant hazard potential classification and has a fair condition assessment.

About Tyler Tree Farm Dam

The primary purpose of Tyler Tree Farm Dam is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Mr J Thornhill 4th (private). It impounds the Roaring Brook near Monroe.

The dam stands 25 feet tall and stretches 285 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 116 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1969, the structure is well into its service life at over 50 years old.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 08/25/2022.

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Significant HazardFair ConditionEmergency Action Plan: Yes

Location

StateNew Hampshire
CountyGrafton
Nearest CityMonroe
River/StreamRoaring Brook
Coordinates44.29360, -72.02580

Physical Characteristics

Dam TypeEarth
NID Height25 ft
Dam Height25 ft
Dam Length285 ft
Year Completed1969 (57 years old)

Storage & Hydraulics

NID Storage116 acre-ft
Max Storage116 acre-ft
Normal Storage9 acre-ft
Surface Area2 acres
Drainage Area2 sq mi
Max Discharge2,443 cfs

Ownership & Safety

PurposeFish and Wildlife Pond
OwnerMR J THORNHILL 4TH
Owner TypePrivate
Hazard ClassificationSignificant
Condition AssessmentFair
Last Inspection08/25/2022
Emergency Action PlanYes

Identifiers

NID IDNH00325
Federal IDNH00325
More InfoState Dam Safety Program

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