Stone Pond Overflow Dam dam
Stone Pond Overflow Dam
Stone Pond Overflow Dam, located in Marlborough, New Hampshire, is a privately-owned structure that serves primarily for recreational purposes. This earth dam, standing at a height of 6.25 feet and a length of 75 feet, helps regulate the flow of Stone Pond Brook and provides a storage capacity of 189 acre-feet. With a surface area of 76 acres and a drainage area of 0.85 square miles, the dam has a low hazard potential and is classified as being in fair condition according to a 2019 assessment.
Managed by the NHDES Dam Bureau, the Stone Pond Overflow Dam features an uncontrolled spillway type with a width of 10 feet, capable of discharging up to 124.8 cubic feet per second. The dam has undergone regular inspections, with the last one conducted in November 2019, and is subject to state regulation, permitting, inspection, and enforcement. Despite a moderate risk assessment rating, the dam is considered safe for its intended purpose and serves as an important asset for water resource and climate enthusiasts in the region.
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 Overflow Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Spicket River At North Salem | 0 cfs | → |
| Exeter River At Haigh Road | 52 cfs | → |
| Spicket River Near Methuen | 16 cfs | → |
| Beaver Brook At North Pelham | 31 cfs | → |
| Parker River At Byfield | 9 cfs | → |
| Merrimack R Nr Goffs Falls | 8,350 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Stone Pond Overflow Dam.
Boat launches
- Phillips Pond Boat Launch
- Long Pond Boat Launch
- Country Pond Boat Launch
- Greenwood Pond Boat Launch
- Beaver Lake Boat Launch
- Stanley Drive 2-4, Haverhill
Campgrounds
- Windham Town Forest Tent Platforms
- Remote Campsite
- Tidewater Campground
- Salisbury State Park Reservation
- Saddleback Campground
- Camp Evergreen
Paddle runs
Track Stone Pond Overflow 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 Overflow Dam
Where does the data for Stone Pond Overflow 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 Overflow Dam.