Harrisville Pond Dam dam
Harrisville Pond Dam
Harrisville Pond Dam, located in Harrisville, New Hampshire, was completed in 1886 and serves as a recreational water resource on Nubanusit Brook. This private dam stands at a height of 21 feet and has a length of 75 feet, with a maximum storage capacity of 2,298 acre-feet. It covers a surface area of 120 acres and has a drainage area of 10 square miles.
Managed by the NHDES Dam Bureau, the dam is state-regulated and undergoes regular inspections, with the last assessment in November 2018 indicating a fair condition. Despite being classified as having a high hazard potential, the overall risk assessment for the dam is moderate. The spillway type is uncontrolled with a width of 4 feet, allowing for a maximum discharge of 337 cubic feet per second.
Water resource and climate enthusiasts will find Harrisville Pond Dam an interesting structure to study, with its historical significance dating back over a century and its critical role in providing recreational opportunities in the area. The dam's maintenance and regulatory oversight by the state ensure its continued safe operation, while its location on Nubanusit Brook adds to its ecological value within the Cheshire County landscape. As a key component of the local water infrastructure, this dam contributes to both human recreation and environmental conservation efforts 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 Harrisville Pond Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Nubanusit Bk Blw Macdowell Dam Nr Peterborough Nh | 31 cfs | → |
| Otter Brook Below Otter Brook Dam | 12 cfs | → |
| S Br Ashuelot River At Webb | 25 cfs | → |
| Contoocook River At Peterborough | 118 cfs | → |
| Ashuelot River Above The Branch | 21 cfs | → |
| Ashuelot River Near Gilsum | 126 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Harrisville Pond Dam.
Boat launches
- Harrisville Pond Boat Launch
- Silver Lake Boat Launch
- Dublin Pond Boat Launch
- Center Pond Boat Launch
- Nubanusit Lake Boat Launch
- Stone Pond Boat Launch
Campgrounds
- Camp Wanocksett
- Mt Monadnock State Park Campground
- Wheelock Park Campground
- Fox Brook Tent Site
- Pilgrim Pines Camping Area
- Swanzey Lake Camping Area
Paddle runs
- First Bridge Upstream On Route 100 To Confluence With West River
- Headwaters To First Bridge Upstream On Route 100
- Sewall's Island To Manchester Street Bridge
- Headwaters To Confluence With West River (End Of Sherman Road)
- Begins In Franklin To Sewall's Island
- Headwaters To Crossing Of Route 100 Near Route 155
Track Harrisville Pond 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 Harrisville Pond Dam
Where does the data for Harrisville Pond 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 High 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 Harrisville Pond Dam.