Green River Dike dam
Green River Dike
The Green River Dike in Morrisville, Vermont, is a crucial structure used for hydroelectric power generation and recreational purposes. 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.
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.
- 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.
- 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.
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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Green River Dike -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Lamoille River At Johnson | 838 cfs | → |
| W Branch Little R Abv Bingham Falls Near Stowe | 20 cfs | → |
| Black River At Coventry | 335 cfs | → |
| Little River Near Waterbury | 340 cfs | → |
| Pope Brook (Site W-3) Nr. N. Danville | 9 cfs | → |
| North Branch Winooski River At Wrightsville | 285 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Green River Dike .
Boat launches
- Green River Dam Road Hyde Park
- Vt Route 15 E Morristown
- Wolcott Pond Road Wolcott
- Vt Route 100 Eden
- Cold Spring Lane Glover
- Shadow Lake Road Glover
Campgrounds
Track Green River Dike in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Green River Dike
Where does the data for Green River Dike come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Significant hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Green River Dike .