Green River Dike Reservoir Report

Last Updated: December 7, 2025

The Green River Dike in Morrisville, Vermont, is a crucial structure used for hydroelectric power generation and recreational purposes.


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Summary

Constructed in 1947, this earth dam stands at a height of 22 feet and stretches 250 feet in length, creating a storage capacity of 16,900 acre-feet and covering a surface area of 625 acres. With a significant hazard potential and a high risk assessment rating, this dam is closely monitored and inspected by the Federal Energy Regulatory Commission to ensure its safety and reliability.

Located along the Green River in Lamoille County, Vermont, this dike plays a vital role in water resource management and energy production in the region. Despite not being state-regulated, the dam serves as an important infrastructure for the local government and surrounding communities. With no spillway and limited discharge capacity, the Green River Dike requires careful monitoring and maintenance to mitigate potential risks and ensure the safety of downstream areas in case of emergencies.

As a key component in the New England District, the Green River Dike is a testament to the intersection of water resource management, climate resilience, and renewable energy generation. With its stone core and soil foundation, this dam reflects the engineering ingenuity of its time while also highlighting the ongoing need for sustainable infrastructure practices to adapt to changing climate conditions and ensure the long-term viability of our water resources.

Year Completed

1947

Dam Length

250

Dam Height

22

River Or Stream

Green River

Primary Dam Type

Earth

Surface Area

625

Drainage Area

14.6

Nid Storage

16900

Hazard Potential

Significant

Foundations

Soil

Nid Height

22
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.