Summary
Built in 1875, this timber crib dam stands at a height of 15 feet and has a storage capacity of 105,200 acre-feet. With a primary purpose of flood risk reduction and hydroelectric power generation, Lock plays a crucial role in the water resource management of the region.
State regulated and inspected, Lock is classified as having a low hazard potential. Despite not being rated for its condition assessment, the dam is maintained regularly with inspections every 12 years. With its strategic location and design, Lock serves as a key infrastructure for water resource management and climate resilience in Piscataquis County, Maine.
As one of the few timber crib dams still in operation today, Lock represents a piece of history in water resource engineering. With its proximity to the New England District and Congressional District 02, Lock continues to play a significant role in the local ecosystem and economy. Enthusiasts of water resources and climate resilience will find Lock to be a captivating example of sustainable infrastructure in the face of changing environmental conditions.
Year Completed |
1875 |
Dam Length |
280 |
Dam Height |
15 |
River Or Stream |
Allagash Stream |
Primary Dam Type |
Timber Crib |
Surface Area |
11200 |
Hydraulic Height |
10 |
Drainage Area |
204 |
Nid Storage |
105200 |
Structural Height |
15 |
Hazard Potential |
Low |
Nid Height |
15 |
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.
Lock