Chase Mill Reservoir Report
Nearby: Rocky Lake Outlet Rocky Lake
Last Updated: December 22, 2025
Chase Mill, located in Washington, Maine, is a concrete dam built in 1870 primarily for flood risk reduction along Chase Mill Stream.
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Summary
With a height of 20 feet and a hydraulic height of 10 feet, the dam serves to protect the surrounding area from potential flooding events. It also offers recreational opportunities for the community, showcasing how water resource management can provide benefits beyond just flood control.
The dam has a storage capacity of 32,900 acre-feet and covers a surface area of 5,250 acres, with a drainage area of 53 square miles. Despite its age, Chase Mill dam has a low hazard potential and has not been rated for its condition. The local government, which owns and regulates the dam, ensures that it is inspected regularly to maintain its structural integrity and effectiveness in flood risk reduction. Chase Mill stands as a testament to the importance of sustainable water resource management in protecting communities and enhancing their quality of life.
In the event of an emergency, the dam's emergency action plan (EAP) is expected to guide response efforts, although specific details about its preparedness and compliance with guidelines are not currently available. With proactive risk management measures in place, Chase Mill serves as a key infrastructure asset in Washington, Maine, demonstrating the crucial role that dams play in safeguarding communities and natural resources in the face of changing climate conditions.
Year Completed |
1870 |
Dam Length |
45 |
Dam Height |
20 |
River Or Stream |
Chase Mill Stream |
Primary Dam Type |
Concrete |
Surface Area |
5250 |
Hydraulic Height |
10 |
Drainage Area |
53 |
Nid Storage |
32900 |
Structural Height |
20 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dennys River At Dennysville
|
1010cfs |
Libby Brook Near Northfield
|
9cfs |
Old Stream Near Wesley
|
27cfs |
St. Croix River At Baring
|
1100cfs |
Narraguagus River At Cherryfield
|
158cfs |
Grand Lake Stream At Grand Lake Stream
|
113cfs |
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.
Chase Mill