Marshfield No. 6 dam
Marshfield No. 6
Marshfield No. 6, also known as Mollys Falls Reservoir, is a public utility owned structure located in Cabot, Vermont. Built in 1927 by CHARLES H. TENNY & CO., this dam serves the primary purpose of hydroelectric power generation, with additional benefits for recreation. Standing at a height of 48 feet and spanning a length of 1100 feet, it impounds Mollys Brook and has a storage capacity of 13,526 acre-feet.
Despite its age, Marshfield No. 6 has not been subject to recent state inspections or assessments, with its condition currently listed as "Not Rated". With a high hazard potential, it is crucial for water resource and climate enthusiasts to monitor and advocate for the maintenance and safety of this critical infrastructure. As a key player in the New England District, this dam plays a significant role in the local community's water management and energy production efforts.
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 Marshfield No. 6 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Pope Brook (Site W-3) Nr. N. Danville | 9 cfs | → |
| Passumpsic River At Passumpsic | 1,110 cfs | → |
| Sleepers River (Site W-5) Near St. Johnsbury | 98 cfs | → |
| North Branch Winooski River At Wrightsville | 285 cfs | → |
| Winooski River At Montpelier | 1,150 cfs | → |
| East Orange Branch At East Orange | 27 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Marshfield No. 6.
Boat launches
- Molly's Pond Boat Launch
- Peacham Pond Boat Ramp
- Camp Road Peacham
- North Pond Road Walden
- Taylor Road Peacham
- Harveys Hollow Road Peacham
Campgrounds
- New Discovery State Park
- Big Deer State Park
- Stillwater State Park
- Ricker Pond State Park
- Sugar Ridge Rv Resort
- Elmore State Park
Paddle runs
- Headwaters At Profile Lake To Southern Boundary Of Franconia Notch State Park
- Headwaters To Folsom Brook
- Proclamation Boundary To Proclamation Boundary
- Woodstock/Thornton Town Line To Thornton Railroad Bridge
- Confluence With Alder Creek To Confluence With Middlebury River
- Source Above Fr 55 To Proclamation Boundary (Stony Brook)
Track Marshfield No. 6 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 Marshfield No. 6
Where does the data for Marshfield No. 6 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 High 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 Marshfield No. 6.