First Conn Lake South Bay Dike dam
First Conn Lake South Bay Dike
First Conn Lake South Bay Dike in Pittsburg, New Hampshire, is a private earth dam on the Connecticut River primarily used for recreation. Standing at a height of 14 feet and spanning 390 feet in length, this structure has a normal storage capacity of 15,950 acre-feet and a maximum storage of 38,950 acre-feet. With a surface area of 2,800 acres and a drainage area of 82 square miles, this dam plays a crucial role in managing water resources in the region.
Maintained and regulated by the NHDES Dam Bureau, First Conn Lake South Bay Dike has a low hazard potential and is currently assessed to be in fair condition as of June 2015. Despite its moderate risk level, the dam has not undergone any recent modifications and has an inspection frequency of 6 years. While the dam does not have a designated Emergency Action Plan (EAP) or inundation maps prepared, its risk management measures and overall safety protocols are continuously monitored to ensure public safety and environmental protection in the event of an emergency.
Overall, First Conn Lake South Bay Dike serves as a vital recreational structure on the Connecticut River, showcasing the importance of proper dam management and maintenance to safeguard water resources and mitigate potential risks associated with dam failure. As climate change continues to impact water availability and extreme weather events, the resilience and sustainability of such structures are paramount in ensuring the safety and well-being of local communities and ecosystems.
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 First Conn Lake South Bay Dike -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Connecticut R Below Indian Stream Nr Pittsburg | 332 cfs | → |
| Diamond River Near Wentworth Location | 315 cfs | → |
| Androscoggin River At Errol | 2,410 cfs | → |
| Connecticut River At North Stratford | 1,420 cfs | → |
| Upper Ammonoosuc River Near Groveton | 511 cfs | → |
| Ellis River At South Andover | 318 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near First Conn Lake South Bay Dike.
Boat launches
- First Connecticut Lake Boat Launch
- Back Lake Boat Launch
- Back Pond Boat Launch
- Chemin Du Lac Saint-Malo
- Lake Access Road Canaan
- Millsfield Pond Boat Launch
Track First Conn Lake South Bay Dike 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 First Conn Lake South Bay Dike
Where does the data for First Conn Lake South Bay Dike 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 First Conn Lake South Bay Dike.