Brassua Reservoir Report
Last Updated: December 18, 2025
Brassua, a private hydroelectric dam located in Rockwood, Maine, on the Moose River, stands as a testament to engineering excellence.
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Summary
Built in 1927 by designer H. S. Ferguson, this concrete dam stands at 50 feet high and spans 1768 feet in length, with a storage capacity of 206,000 acre-feet. Its primary purposes include flood risk reduction, hydroelectric power generation, recreation, and water supply for the region.
With a high hazard potential and a very high risk assessment rating, Brassua is closely monitored by the Federal Energy Regulatory Commission. The dam features a controlled spillway design with a width of 284 feet and a maximum discharge capacity of 74,940 cubic feet per second. Despite its age, Brassua remains a crucial infrastructure for water resource management in the area, serving as a vital link in the region's hydroelectric power generation and water supply network.
Though not state-regulated, Brassua's importance as a source of renewable energy and water management cannot be understated. With a rich history dating back to its construction nearly a century ago, this engineering marvel continues to play a pivotal role in balancing the water needs of the region while providing clean, renewable energy to its residents.
Year Completed |
1927 |
Dam Length |
1768 |
Dam Height |
50 |
River Or Stream |
Moose River |
Primary Dam Type |
Concrete |
Surface Area |
9700 |
Drainage Area |
722 |
Nid Storage |
206000 |
Outlet Gates |
Other Controlled - 12, Slide (sluice gate) - 8 |
Hazard Potential |
High |
Nid Height |
50 |
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.
Brassua
Jackman Road 1139, Rockwood