Lebanon Water Treatment Intake Dam dam
Lebanon Water Treatment Intake Dam
The Lebanon Water Treatment Intake Dam, located on the Mascoma River in Grafton County, New Hampshire, serves as a crucial water supply structure for the city of Lebanon. Built in 1934, this concrete dam stands at a height of 16 feet and has a length of 140 feet, providing a storage capacity of 3.7 billion gallons of water. With a significant hazard potential but a satisfactory condition assessment, the dam is regulated, inspected, and enforced by the NHDES Dam Bureau to ensure its safety and functionality.
Despite its age, the Lebanon Water Treatment Intake Dam continues to play a vital role in water resource management, with a normal storage capacity of 0.92 billion gallons and a drainage area of 169 square miles. The dam's uncontrolled spillway, with a width of 93 feet, is designed to handle a maximum discharge of 5314 cubic feet per second to prevent potential flooding. The risk assessment for this structure is moderate, and appropriate risk management measures are in place to address any potential issues that may arise.
As a key component of Lebanon's water infrastructure, the Lebanon Water Treatment Intake Dam is essential for providing clean and safe drinking water to the local community. With regular inspections, a robust emergency action plan, and adherence to state regulatory standards, this dam exemplifies the importance of proper maintenance and management of water resources in the face of changing climate conditions.
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 Lebanon Water Treatment Intake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Connecticut River At West Lebanon | 6,790 cfs | → |
| Ottauquechee River At North Hartland | 394 cfs | → |
| Ompompanoosuc River At Union Village | 16 cfs | → |
| White River At West Hartford | 1,370 cfs | → |
| Sugar River At West Claremont | 431 cfs | → |
| Baker River Near Rumney | 367 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lebanon Water Treatment Intake Dam.
Boat launches
- Mascoma Lake Boat Launch
- Connecticut River Boat Launch
- Crystal Lake Boat Launch
- George Pond Boat Launch
- Grafton Pond Boat Launch
- Mcdaniels Marsh Boat Launch
Campgrounds
Fishing spots
Paddle runs
- Source Above Fr 55 To Proclamation Boundary (Stony Brook)
- Headwaters To Woodstock, Vt
- Begins In Franklin To Sewall's Island
- Thornton Railroad Bridge To Bridgewater/Bristol Town Line
- Woodstock/Thornton Town Line To Thornton Railroad Bridge
- Headwaters To Crossing Of Route 100 Near Route 155
Track Lebanon Water Treatment Intake Dam 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 Lebanon Water Treatment Intake Dam
Where does the data for Lebanon Water Treatment Intake Dam 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 Lebanon Water Treatment Intake Dam.