Morrisville Back Spillway Reservoir Report
Nearby: Morrisville Cadys Falls
Last Updated: December 11, 2025
Morrisville Back Spillway in Vermont is a historic gravity dam completed in 1924 along the Lamoille River, serving a primary purpose of hydroelectric power generation.
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Summary
The dam stands at a height of 8 feet and is 150 feet long, with a storage capacity of 150 acre-feet. The spillway, with a width of 60 feet, is uncontrolled, allowing a maximum discharge of 35,000 cubic feet per second to prevent overflow and ensure safety.
Managed by the Federal Energy Regulatory Commission, Morrisville Back Spillway has a low hazard potential and a moderate risk assessment rating. Although not state-regulated, the dam is under federal oversight for inspections and operations. With a drainage area of 222 square miles, the dam plays a vital role in water resource management and renewable energy production in the region, showcasing the intersection of infrastructure, environmental conservation, and climate resilience.
For water resource and climate enthusiasts, Morrisville Back Spillway offers a glimpse into the historical development of hydroelectric infrastructure in Vermont and its ongoing role in sustainable energy production. The dam's design, location, and operational characteristics provide valuable insights into the complex interplay between human-made structures, natural water systems, and regulatory frameworks. As a key component of the New England District's water management infrastructure, Morrisville Back Spillway stands as a testament to the enduring importance of balancing energy needs with environmental stewardship in the face of a changing climate.
Year Completed |
1924 |
Dam Length |
150 |
Dam Height |
8 |
River Or Stream |
Lamoille River |
Primary Dam Type |
Gravity |
Surface Area |
15 |
Drainage Area |
222 |
Nid Storage |
150 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
8 |
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 |
|---|---|---|
Elmore State Park
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Lake Elmore State Park
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Campsite #29
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Campsite #24
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Campsite #30
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Campsite #34
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Morrisville Back Spillway