Henderson #2 Reservoir Report
Nearby: Henderson #1 Megunticook East
Last Updated: December 19, 2025
Henderson #2 is a private earth dam located in Knox, Maine, serving primarily for recreation purposes.
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Summary
Built in 1970 with a height of 11 feet and a capacity of 250 acre-feet, this dam stands as a low hazard structure with a hydraulic height of 9 feet. The dam has not been rated for its condition assessment, but it is under state regulation, permitting, inspection, and enforcement by the Maine Emergency Management Agency (MEMA).
Situated near an unknown river or stream, Henderson #2 covers a surface area of 28 acres and drains a small 0.4 square mile area. Although the dam does not have an associated spillway or outlet gates listed, it poses a low hazard potential and has an inspection frequency of every 12 months. Despite lacking certain updated emergency preparedness measures such as an Emergency Action Plan (EAP) and inundation maps, Henderson #2 remains a notable structure in the New England District, overseen by the state of Maine and serving various purposes including fire protection, stock, fish and wildlife, and recreational activities.
Overall, Henderson #2 stands as a modest yet important structure contributing to water resource management and climate resilience in the region. Enthusiasts of water resources and climate dynamics would find interest in monitoring this dam's condition, regulatory oversight, and its role in providing recreational opportunities while ensuring public safety and environmental sustainability.
Year Completed |
1970 |
Dam Length |
200 |
Dam Height |
11 |
River Or Stream |
unknown |
Primary Dam Type |
Earth |
Surface Area |
28 |
Hydraulic Height |
9 |
Drainage Area |
0.4 |
Nid Storage |
250 |
Structural Height |
11 |
Hazard Potential |
Low |
Nid Height |
11 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Henderson #2
MEGUNTICOOK LAKE