Bog Pond Dam dam
Bog Pond Dam
Bog Pond Dam, also known as Danbury Bog Dam, is a privately owned structure located in Danbury, New Hampshire. Completed in 1948, this Earth dam stands at a height of 17 feet and spans 160 feet in length, with a storage capacity of 1000 acre-feet and a surface area of 99 acres. Situated on Bog Brook, this dam serves primarily for recreational purposes and is regulated by the NHDES DAM BUREAU, ensuring that it undergoes regular inspections to maintain its satisfactory condition.
With a significant hazard potential and a moderate risk assessment rating, Bog Pond Dam is equipped with an uncontrolled spillway with a width of 55 feet to manage maximum discharges up to 2950 cubic feet per second. While the dam has not been modified in recent years, it is subject to inspection every four years to assess its structural integrity and emergency preparedness measures. Despite being privately owned, the dam falls under state jurisdiction and regulation, demonstrating a collaborative effort between private owners and regulatory agencies to ensure the safety and functionality of this essential water resource infrastructure in Merrimack, New Hampshire.
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 Bog Pond Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Smith River Near Bristol | 257 cfs | → |
| Merrimack River At Franklin Junction | 6,760 cfs | → |
| Winnipesaukee River At Tilton | 1,590 cfs | → |
| Blackwater River Near Webster | 19 cfs | → |
| Pemigewasset River At Plymouth | 2,450 cfs | → |
| Warner River At Davisville | 527 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Bog Pond Dam.
Boat launches
- School Pond Boat Launch
- Waukeena Lake Boat Launch
- Adder Pond Boat Launch
- Highland Lake Boat Launch
- Pleasant Lake Boat Launch
- Tewksbury Pond Boat Launch
Campgrounds
- Camp Wilmot
- Clark Brook Campsite
- Cardigan Campsites
- Owl's Landing Campground
- Moose Mountain Shelter
- Wister #1
Paddle runs
- Begins In Franklin To Sewall's Island
- Sewall's Island To Manchester Street Bridge
- Thornton Railroad Bridge To Bridgewater/Bristol Town Line
- Woodstock/Thornton Town Line To Thornton Railroad Bridge
- Headwaters At Profile Lake To Southern Boundary Of Franconia Notch State Park
- Source Above Fr 55 To Proclamation Boundary (Stony Brook)
Track Bog 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 Bog Pond Dam
Where does the data for Bog 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 Significant 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 Bog Pond Dam.