Baker River Site 11 Dam Reservoir Report

Last Updated: December 15, 2025

Baker River Site 11 Dam, also known as Site 11 Floodwater Dam, is a state-owned structure in New Hampshire designed by USDA NRCS to primarily reduce flood risk along the TR Baker River.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1971, this earth dam stands at a height of 24 feet and stretches over 681 feet, with a storage capacity of 125 acre-feet. The dam's purposes include flood risk reduction, and it has a spillway width of 16 feet for uncontrolled water release.

Located in Grafton County, New Hampshire, in the city of Wentworth, Baker River Site 11 Dam is regulated by the NHDES Dam Bureau, with state permitting, inspection, and enforcement in place. The dam has a high hazard potential, but as of the last assessment in May 2018, its condition was deemed satisfactory. In the event of an emergency, the dam's Emergency Action Plan (EAP) status and risk assessment are currently unspecified, presenting a potential area for improvement.

Water resource and climate enthusiasts will find Baker River Site 11 Dam's engineering details and risk management measures intriguing, given its moderate risk classification and significant impact on flood control in the region. With a focus on flood risk reduction, this state-owned dam plays a crucial role in protecting the surrounding area from potential inundation, highlighting the importance of effective dam management and emergency preparedness in safeguarding water resources and communities against natural disasters.

Year Completed

1971

Dam Length

681

Dam Height

24

River Or Stream

TR BAKER RIVER

Primary Dam Type

Earth

Surface Area

2.8

Drainage Area

0.62

Nid Storage

125

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

24
       
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.