Lower Mountain Lake Dam
Key Takeaway
Lower Mountain Lake Dam is classified as significant hazard in New Hampshire. It was completed in 1967 and is 59 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 33 ft (taller than 89.6% in NH) |
| Dam Length | 850 ft |
| Dam Type | Earth |
| Max Storage | 376 acre-ft |
| Normal Storage | 191 acre-ft |
| Surface Area | 41 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 1,650 cfs |
| Year Completed | 1967 (59 years old) |
| Year Modified | 2015 |
| NID ID | NH00195 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
MOUNTAIN LAKES VILLAGE DISTRICT
Local Government
Nearby Dams
Upper Mountain Lake Dam
Grafton, NH
Low Hazard 31 ftAmmonoosuc River
Grafton, NH
Low Hazard 17 ftFenn Dam
Grafton, NH
Low Hazard 25 ftWoodsville
Grafton, NH
Significant Hazard 12 ftLisbon Wastewater Lagoons Dam
Grafton, NH
Significant Hazard 13 ftChandler Pond Dam
Grafton, NH
Significant Hazard 14 ftNewbury
Orange, VT
Significant Hazard 20 ftLong Pond Dam
Grafton, NH
Significant Hazard 12 ftFrequently Asked Questions
What is the hazard classification of Lower Mountain Lake Dam?
Lower Mountain Lake Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Lower Mountain Lake Dam?
Lower Mountain Lake Dam is owned by MOUNTAIN LAKES VILLAGE DISTRICT (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Mountain Lake Dam built?
Lower Mountain Lake Dam was completed in 1967, making it 59 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Lower Mountain Lake Dam?
Lower Mountain Lake Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lower Mountain Lake Dam?
Lower Mountain Lake Dam has a dam height of 33 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Lower Mountain Lake Dam last inspected?
Lower Mountain Lake Dam was last inspected on April 27, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.