Worumbo Reservoir Report
Nearby: Farnsworth Pejepscot
Last Updated: December 18, 2025
Worumbo, also known as Durham Dam, is a concrete gravity dam located in Lisbon, Maine, along the Androscoggin River.
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Summary
Built in 1988 by the E. C. Jordan Company, the dam stands at a height of 17 feet and has a length of 870 feet. Its primary purpose is for hydroelectric power generation, making it a vital structure for water resource management in the area.
With a storage capacity of 1700 acre-feet and a maximum discharge of 136,735 cubic feet per second, Worumbo plays a crucial role in regulating water flow and providing flood control. The dam is federally regulated by the Federal Energy Regulatory Commission and undergoes inspections every three years to ensure its structural integrity and operational efficiency.
Despite being classified with a low hazard potential, Worumbo is considered to have a very high risk assessment due to its critical function in the region. Emergency action plans are in place, although detailed condition assessments are not currently available. Worumbo stands as a testament to sustainable water management practices and the intersection of climate resilience with hydroelectric power generation.
Year Completed |
1988 |
Dam Length |
870 |
Dam Height |
17 |
River Or Stream |
Androscoggin River |
Surface Area |
190 |
Drainage Area |
3370 |
Nid Storage |
1700 |
Outlet Gates |
Other Controlled - 2, Slide (sluice gate) - 4 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
17 |
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.
Worumbo
Pejepscot Boat Ramp