Stone Pond Mill Outlet Dam Reservoir Report
Nearby: Meetinghouse Pond Dam Minnewawa
Last Updated: December 16, 2025
Stone Pond Mill Outlet Dam, nestled in Marlborough, New Hampshire, stands as a testament to early 20th-century engineering, having been completed in 1920.
°F
°F
mph
Wind
%
Humidity
Summary
This private Earth dam primarily serves recreational purposes along the tranquil waters of Stone Pond Brook. With a dam height of 6.5 feet and a storage capacity of 189 acre-feet, the dam offers a serene surface area of 76 acres for water enthusiasts to enjoy.
Managed and regulated by the New Hampshire Department of Environmental Services Dam Bureau, the Stone Pond Mill Outlet Dam boasts a low hazard potential and fair condition assessment. Despite its moderate risk level, the dam continues to provide a safe and enjoyable environment for visitors. With its uncontrolled spillway and proximity to the New England District, this historic landmark remains a must-visit destination for water resource and climate enthusiasts seeking to explore the intersection of nature and human ingenuity.
As the sun sets over the Cheshire County landscape, the Stone Pond Mill Outlet Dam stands as a reminder of our responsibility to protect and cherish our precious water resources. With regular inspections, a dedicated emergency action plan, and a commitment to risk management, this dam symbolizes the harmonious balance between human recreation and environmental stewardship. Whether you're a local resident or a curious traveler, come immerse yourself in the beauty and resilience of Stone Pond Mill Outlet Dam—a timeless marvel in the heart of New Hampshire's waterways.
Year Completed |
1920 |
Dam Length |
100 |
Dam Height |
6.5 |
River Or Stream |
STONE POND BROOK |
Primary Dam Type |
Earth |
Surface Area |
76 |
Drainage Area |
0.85 |
Nid Storage |
189 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
7 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
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. Investigations and studies are necessary.
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.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams 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, environment 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.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Mt Monadnock State Park Campground
|
||
Camp Wanocksett
|
||
Pilgrim Pines Camping Area
|
||
Wheelock Park Campground
|
||
Swanzey Lake Camping Area
|
Stone Pond Mill Outlet Dam
Stone Pond boat launch