Marks Lake Reservoir Report
Nearby: Middle River Chase Mill
Last Updated: December 23, 2025
Marks Lake, located in Washington, Maine, is a private water supply reservoir with a primary purpose of providing water.
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Summary
Built in 1820, this concrete dam stands at 12 feet high and stretches 145 feet in length, with a storage capacity of 1322 acre-feet. The dam is situated along the Middle River and covers a surface area of 182.4 acres, serving as a crucial resource for the surrounding area.
Despite its historical significance, Marks Lake has been flagged with a poor condition assessment as of December 2011, indicating a need for maintenance and potential improvements. The dam's hazard potential is classified as low, but its inspection frequency is set at 12 months. The surrounding community, including Congressman Jared F. Golden (D), must work together to ensure the safety and sustainability of Marks Lake for future generations.
As water resource and climate enthusiasts, it is vital to monitor the state-regulated dam's condition and take proactive measures to address any deficiencies. With its rich history and importance as a water supply source, Marks Lake serves as a reminder of the delicate balance between human development and environmental conservation. By staying informed and actively participating in its preservation, we can ensure the longevity and integrity of this essential water resource.
Year Completed |
1820 |
Dam Length |
145 |
Dam Height |
12 |
River Or Stream |
Middle River |
Primary Dam Type |
Concrete |
Surface Area |
182.4 |
Hydraulic Height |
12 |
Drainage Area |
6.4 |
Nid Storage |
1322 |
Structural Height |
12 |
Hazard Potential |
Low |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Libby Brook Near Northfield
|
9cfs |
Dennys River At Dennysville
|
1010cfs |
Old Stream Near Wesley
|
27cfs |
Narraguagus River At Cherryfield
|
158cfs |
St. Croix River At Baring
|
1100cfs |
East Br Bear Brook Near Beddington
|
0cfs |
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.
Marks Lake