Otter Flowage Dike Reservoir Report
Nearby: Otter Dam Maccrae Flowage
Last Updated: December 22, 2025
Otter Flowage Dike in Maine is a federal-owned structure that serves as a fish and wildlife pond along the Otter Flowage river.
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Summary
The dam is primarily an earth-type structure with a height of 11.2 meters and a hydraulic height of 8.2 meters. It has a storage capacity of 94 acre-feet, with a normal storage level of 65 acre-feet. The dam spans a length of 730 meters and covers a surface area of 15 acres.
Managed by the Maine Emergency Management Agency (MEMA), the Otter Flowage Dike is regulated, permitted, inspected, and enforced by the state. Despite its low hazard potential, the dam's condition assessment is currently not rated, and it has not been inspected since the year 1899. Emergency action plans, risk assessments, and inundation maps for the structure are currently not in place, raising concerns about its safety and preparedness in the face of potential climate-related events.
For water resource and climate enthusiasts, Otter Flowage Dike presents an intriguing case study in the intersection of infrastructure management, environmental conservation, and climate resilience. As efforts to assess and improve the dam's safety and emergency preparedness continue, stakeholders are urged to stay engaged with developments related to this critical structure in Washington, Maine.
Dam Length |
730 |
Dam Height |
11.2 |
River Or Stream |
Otter Flowage |
Primary Dam Type |
Earth |
Surface Area |
15 |
Hydraulic Height |
8.2 |
Nid Storage |
94 |
Structural Height |
11.2 |
Hazard Potential |
Low |
Nid Height |
11 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
St. Croix River At Baring
|
1100cfs |
Dennys River At Dennysville
|
1010cfs |
Grand Lake Stream At Grand Lake Stream
|
113cfs |
Old Stream Near Wesley
|
27cfs |
Libby Brook Near Northfield
|
9cfs |
St. Croix River At Vanceboro
|
369cfs |
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.
Otter Flowage Dike