Middle River Reservoir Report
Nearby: Marks Lake Chase Mill
Last Updated: December 22, 2025
Middle River in Washington, Maine, is a state-regulated dam designed for flood risk reduction.
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Summary
Completed in 1900, this dam stands at 16 feet high with a storage capacity of 92 acre-feet. With a primary purpose of flood risk reduction, Middle River also serves recreational activities in the area. The dam is classified as a rockfill structure with a length of 350 feet, providing essential protection for the surrounding community.
Managed by the Maine Emergency Management Agency (MEMA), Middle River has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite its age, the dam continues to meet state regulatory standards, with regular inspections every 12 months. With a latitude of 44.72 and a longitude of -67.45, Middle River plays a crucial role in safeguarding the region from potential flooding events. Water resource and climate enthusiasts will appreciate the historical significance and ongoing functionality of this essential infrastructure.
Year Completed |
1900 |
Dam Length |
350 |
Dam Height |
16 |
River Or Stream |
MIDDLE RIVER |
Primary Dam Type |
Other |
Hydraulic Height |
14 |
Nid Storage |
92 |
Structural Height |
16 |
Hazard Potential |
Low |
Nid Height |
16 |
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.
Middle River