Weston dam
Weston
Weston, also known as Lower Groveton Dam, is a private hydroelectric structure located on the Upper Ammonoosuc River in Groveton, New Hampshire. Built in 1987, this timber crib dam stands at 20 feet tall and stretches 210 feet in length, with a storage capacity of 275 acre-feet. Managed by the New Hampshire Department of Environmental Services Dam Bureau, Weston is classified as a low hazard potential structure with a moderate risk assessment rating.
The Federal Energy Regulatory Commission oversees Weston's operations and inspections, ensuring its compliance with safety regulations. The dam features an uncontrolled spillway with a width of 118 feet, and is equipped with four slide (sluice) gates for water release. While the dam's condition assessment is currently not available, its last inspection was conducted in January 2021. With a drainage area of 263 square miles and a maximum discharge capacity of 14,250 cubic feet per second, Weston plays a crucial role in the region's hydroelectric power generation and water resource management.
Despite its low hazard potential, Weston remains an essential piece of infrastructure for the surrounding community, providing renewable energy and contributing to the overall water resource management in the area. Its strategic location on the Upper Ammonoosuc River highlights the importance of sustainable hydropower development and the need for effective dam oversight to ensure public safety and environmental conservation. As climate change continues to impact water resources, structures like Weston will play a key role in adapting to and mitigating its effects on the local ecosystem.
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 Weston -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Upper Ammonoosuc River Near Groveton | 650 cfs | → |
| Connecticut River At North Stratford | 1,840 cfs | → |
| Connecticut River Near Dalton | 4,210 cfs | → |
| Moose River At Victory | 213 cfs | → |
| East Branch Passumpsic River Near East Haven | 152 cfs | → |
| Androscoggin River Near Gorham | 3,790 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Weston .
Boat launches
- Bridge Street Guildhall
- Martin Meadow Pond Boat Launch
- Nay Pond Boat Launch
- Vermont Fish And Game Boat Lau Lunenburg
- Overlook Road 123, Milan
- Milan
Campgrounds
- Percy Loop Tentsite
- Maidstone State Park
- Unknown Pond Tentsite
- Unknown Pond Campsite
- Mt Cabot Cabin
- Rogers Ledge Campsite
Track Weston 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 Weston
Where does the data for Weston 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 Low 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 Weston .