Northfield Mt. - Upper Reservoir Spillway Reservoir Report
Last Updated: December 12, 2025
Calling all water resource and climate enthusiasts!
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Summary
The Northfield Mt. Upper Reservoir Spillway in Massachusetts is a fascinating structure designed for hydroelectric power generation and recreation purposes. Completed in 1973, this concrete gravity dam stands at a height of 10 feet and spans a length of 550 feet, providing a storage capacity of 21,500 acre-feet. With a maximum discharge capacity of 12,900 cubic feet per second, this dam plays a crucial role in managing water flow in the Connecticut River.
Owned by a public utility, the Northfield Mt. Upper Reservoir Spillway is regulated by the Federal Energy Regulatory Commission and has a low hazard potential. Despite its moderate risk level, the dam has not undergone a recent condition assessment. However, emergency action plans have been prepared and updated to ensure the safety and security of the surrounding area in case of any unforeseen events. With its uncontrolled spillway type and a spillway width of 536 feet, this dam is a key player in the region's water resource management infrastructure.
Located in Franklin County, Massachusetts, the Northfield Mt. Upper Reservoir Spillway is not state-jurisdiction regulated but falls under the purview of federal oversight. With its multi-arch core type and rock foundation, this dam stands as a testament to engineering excellence in harnessing the power of water for both energy production and recreational activities. As climate change continues to impact water resources, structures like the Northfield Mt. Upper Reservoir Spillway play a crucial role in adapting to changing environmental conditions and ensuring the sustainable management of our precious water sources.
Year Completed |
1973 |
Dam Length |
550 |
Dam Height |
10 |
River Or Stream |
Connecticut River |
Primary Dam Type |
Concrete |
Surface Area |
278 |
Drainage Area |
1 |
Nid Storage |
21500 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
10 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Erving State Forest
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Richardson-Zlogar Cabin
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Barton Cove
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Tully Lake
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Falls Brook Shelter
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Northfield Mt. - Upper Reservoir Spillway
Regulating Dam Road, New Salem