Uncanoonuc Lake Dam dam
Uncanoonuc Lake Dam
Uncanoonuc Lake Dam, located in Goffstown, New Hampshire, stands as a vital structure for recreation and water resource management in the region. Built in 1936, this earth dam with a height of 10 feet and a length of 176 feet, controls the flow of the Dan Little Brook, providing a surface area of 25.7 acres and a drainage area of 0.27 square miles. With a storage capacity of 318 acre-feet, the dam plays a crucial role in maintaining a normal storage level of 211 acre-feet for recreational activities.
Managed by the local government and regulated by the New Hampshire Department of Environmental Services Dam Bureau, Uncanoonuc Lake Dam has a Satisfactory condition assessment, despite being classified with a High hazard potential. It has an uncontrolled spillway type, with a spillway width of 4 feet and a maximum discharge capacity of 65.8 cubic feet per second. The dam undergoes regular inspections, with the last one conducted in October 2019, and has a moderate risk assessment rating of 3.
Overall, Uncanoonuc Lake Dam serves as a critical infrastructure for water resource management and recreational purposes in the Hillsborough County area of New Hampshire. Its historical significance, coupled with its ongoing regulatory oversight and maintenance, ensures the safety and sustainability of the surrounding environment while providing opportunities for outdoor activities and enjoyment for the local community and visitors alike.
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 Uncanoonuc Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Piscataquog River Near Goffstown | 137 cfs | → |
| South Branch Piscataquog River Near Goffstown | 127 cfs | → |
| Merrimack R Nr Goffs Falls | 8,350 cfs | → |
| Piscataquog River Bl Everett Dam | 8 cfs | → |
| Souhegan River At Merrimack | 235 cfs | → |
| Souhegan River (Site Wlr-1) Near Milford | 168 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Uncanoonuc Lake Dam.
Boat launches
- Piscataquog River (Glen Lake) Boat Launch
- Bailey Pond Boat Launch
- Gorham Pond Boat Launch
- Kimball Pond Boat Launch
- Heritage Trail Bedford
- Mount William Pond Boat Launch
Campgrounds
- Mile-Away Campground
- Camp Spaulding
- Windham Town Forest Tent Platforms
- Remote Campsite
- Saddleback Campground
- Pearl Hill Campground
Paddle runs
Track Uncanoonuc Lake 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 Uncanoonuc Lake Dam
Where does the data for Uncanoonuc Lake 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 Uncanoonuc Lake Dam.