Mutton Ridge Dikes 6 Reservoir Report
Last Updated: December 19, 2025
Mutton Ridge Dikes 6, 7, and 8, located on the St.
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Summary
Lawrence River in Massena, New York, were designed by Chas. T. Main and completed in 1958 for hydroelectric and navigation purposes. These earth dams, with a height of 23 feet and a length of 7300 feet, provide storage of up to 803,000 acre-feet of water and cover a surface area of 37,500 acres. Despite their low hazard potential, the risk assessment indicates a high risk level of 2, prompting the need for ongoing monitoring and management measures.
Owned by the state of New York and regulated by the Federal Energy Regulatory Commission, Mutton Ridge Dikes are inspected regularly to ensure their structural integrity and safety. With six associated structures and a drainage area of 300,000 acres, these dikes play a crucial role in managing water resources and supporting the region's energy needs. Although the condition assessment is not available, the emergency action plan and risk management measures are in place to address any potential hazards and ensure the safety of the surrounding community.
As part of the New York District of the US Army Corps of Engineers, Mutton Ridge Dikes 6, 7, and 8 are vital components of the region's water infrastructure. With their strategic location on the St. Lawrence River, these dikes contribute to the efficient operation of the hydroelectric facilities and facilitate navigation in the area. Their historical significance and ongoing maintenance highlight the importance of sustainable water resource management and climate resilience efforts in the face of changing environmental conditions.
Year Completed |
1958 |
Dam Length |
7300 |
Dam Height |
23 |
River Or Stream |
St. Lawrence River |
Primary Dam Type |
Earth |
Surface Area |
37500 |
Drainage Area |
300000 |
Nid Storage |
803000 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
23 |
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.
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