Lower Lisbon dam
Lower Lisbon
Lower Lisbon is a private hydroelectric dam located in Bath, New Hampshire, along the Ammonoosuc River. Completed in 1986, this concrete gravity dam stands at a height of 18 feet and has a length of 292 feet. With a storage capacity of 96 acre-feet and a surface area of 64 acres, Lower Lisbon plays a crucial role in generating power from the river's flow, with a maximum discharge of 1200 cubic feet per second.
Managed by the Federal Energy Regulatory Commission, Lower Lisbon is subject to regular inspections and enforcement to ensure its safety and compliance with regulations. Despite its low hazard potential, the dam is considered to have a moderate risk level, with a risk assessment rating of 3 out of 5. The dam features an uncontrolled spillway with a width of 272 feet, along with two slide (sluice gate) outlet gates for water release.
Overall, Lower Lisbon serves as a vital infrastructure for harnessing renewable energy from the river, contributing to the region's hydroelectric power generation. Its strategic location and design make it an essential component in the management of water resources and climate considerations in the area.
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 Lower Lisbon -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Connecticut River At Wells River | 4,490 cfs | → |
| Wells River At Wells River | 207 cfs | → |
| Passumpsic River At Passumpsic | 942 cfs | → |
| Ammonoosuc River At Bethlehem Junction | 267 cfs | → |
| Connecticut River Near Dalton | 3,330 cfs | → |
| Sleepers River (Site W-5) Near St. Johnsbury | 87 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lower Lisbon .
Boat launches
- Lyman Road Lyman
- Partridge Lake Boat Launch
- French Pond Boat Launch
- Old Waterford Road Littleton
- Echo Lake Boat Launch
- Perkins Landing Road Littleton
Campgrounds
- Crazy Horse Family Campground
- Fransted Campground
- Coppermine Shelter
- Kinsman Pond Shelter
- Kinsman Pond Tentsite
- Cannon Mountain Rv Park
Paddle runs
- Headwaters At Profile Lake To Southern Boundary Of Franconia Notch State Park
- Woodstock/Thornton Town Line To Thornton Railroad Bridge
- Thornton Railroad Bridge To Bridgewater/Bristol Town Line
- Headwaters To Folsom Brook
- Source Above Fr 55 To Proclamation Boundary (Stony Brook)
- Proclamation Boundary To Proclamation Boundary
Track Lower Lisbon 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 Lower Lisbon
Where does the data for Lower Lisbon 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 Lower Lisbon .