Summary
Built in 1932, this concrete gravity dam stands at 15 feet tall and spans 232 feet in length, with a storage capacity of 8,500 acre-feet and a maximum discharge of 6,687 cubic feet per second. Despite being classified as having a low hazard potential, it is subject to periodic inspections by the Federal Energy Regulatory Commission to ensure its safety and integrity.
With its multi-arch core and rock foundations, Mahaney plays a vital role in generating hydroelectric power for the region. Its uncontrolled spillway, 150 feet wide, helps manage water flow during periods of excess discharge. Although the dam has not been modified in recent years and its condition assessment is not available, its risk assessment indicates a moderate level of risk, prompting ongoing monitoring and risk management measures to safeguard the surrounding area.
In the event of an emergency, Mahaney's owners are expected to have an emergency action plan in place, although details about its preparation and adherence to guidelines are not provided. Despite its remote location and moderate risk profile, Mahaney stands as a testament to sustainable energy generation and responsible management of water resources in the beautiful landscape of Franklin County, Maine.
Year Completed |
1932 |
Dam Length |
232 |
Dam Height |
15 |
River Or Stream |
Kennebago River |
Primary Dam Type |
Concrete |
Surface Area |
1700 |
Drainage Area |
112 |
Nid Storage |
8500 |
Outlet Gates |
Other Controlled - 15 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Diamond River Near Wentworth Location
|
126cfs |
Androscoggin River At Errol
|
1500cfs |
Dead River Near Dead River
|
786cfs |
Spencer Stream At Mouth
|
104cfs |
Connecticut R Below Indian Stream Nr Pittsburg
|
183cfs |
Swift River Near Roxbury
|
89cfs |
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.
Mahaney