Stone Pond Mill Outlet Dam dam
Stone Pond Mill Outlet Dam
Stone Pond Mill Outlet Dam, nestled in Marlborough, New Hampshire, stands as a testament to early 20th-century engineering, having been completed in 1920. 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.
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 Stone Pond Mill Outlet Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| S Br Ashuelot River At Webb | 25 cfs | → |
| Otter Brook Below Otter Brook Dam | 12 cfs | → |
| Ashuelot River Above The Branch | 21 cfs | → |
| Nubanusit Bk Blw Macdowell Dam Nr Peterborough Nh | 31 cfs | → |
| Ashuelot River At West Swanzey | 598 cfs | → |
| Contoocook River At Peterborough | 118 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Stone Pond Mill Outlet Dam.
Boat launches
- Stone Pond Boat Launch
- Meetinghouse Pond Boat Launch
- Dublin Pond Boat Launch
- Silver Lake Boat Launch
- Perkins Pond Boat Launch
- Harrisville Pond Boat Launch
Campgrounds
- Mt Monadnock State Park Campground
- Camp Wanocksett
- Pilgrim Pines Camping Area
- Wheelock Park Campground
- Swanzey Lake Camping Area
- Falls Brook Shelter
Paddle runs
- First Bridge Upstream On Route 100 To Confluence With West River
- Headwaters To First Bridge Upstream On Route 100
- Headwaters To Confluence With West River (End Of Sherman Road)
- Sewall's Island To Manchester Street Bridge
- Headwaters To North Of Searsburg Reservoir
- Headwaters To Crossing Of Route 100 Near Route 155
Track Stone Pond Mill Outlet 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 Stone Pond Mill Outlet Dam
Where does the data for Stone Pond Mill Outlet 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 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 Stone Pond Mill Outlet Dam.