Upper Little Falls Reservoir Report
Nearby: Perry Station Dam Daly Flowage Dam
Last Updated: January 12, 2026
Upper Little Falls, nestled in the serene beauty of Washington, Maine, stands as a marvel of engineering and nature conservation.
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Summary
This concrete dam, standing at a height of 20 feet and stretching 120 feet in length, was completed in 1950 with a primary purpose of hydroelectric power generation. It also serves as a vital resource for fish and wildlife, flood risk reduction, recreation, and more, showcasing its multi-faceted role in water resource management.
With a storage capacity of 5600 acre-feet and a surface area of 1209 acres, Upper Little Falls plays a crucial role in regulating the Pennamaquan River's flow and supporting the local ecosystem. The dam's condition is assessed as satisfactory, with a significant hazard potential that necessitates regular inspections. The state of Maine, through MEMA, enforces strict regulatory measures to ensure the dam's safety and functionality, demonstrating a commitment to responsible water resource management and climate resilience.
Visitors to Upper Little Falls not only witness a stunning display of hydraulic engineering but also experience the harmonious blend of human ingenuity and environmental stewardship. As a key player in the New England District, this dam symbolizes the intersection of innovation, conservation, and sustainability in the realm of water resources. Its presence underscores the importance of balancing energy production with ecological preservation, making it a must-visit destination for water resource and climate enthusiasts seeking inspiration and insight into the intricate relationship between humans and nature.
Year Completed |
1950 |
Dam Length |
120 |
Dam Height |
20 |
River Or Stream |
Pennamaquan |
Primary Dam Type |
Concrete |
Surface Area |
1209 |
Hydraulic Height |
14 |
Drainage Area |
40 |
Nid Storage |
5600 |
Structural Height |
20 |
Hazard Potential |
Significant |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Reversing Falls Park
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Cobscook Bay State Park
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Cobscook Bay State Park Campground
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Kiwanis Oceanfront CG
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Upper Little Falls