Tannery Pond Dam dam
Tannery Pond Dam
Tannery Pond Dam, located in Wilmot, New Hampshire, is a historic Earth dam completed in 1850 with a primary purpose of recreation. It stands at 12 feet high and spans 160 feet in length, holding a maximum storage capacity of 96 acre-feet. The dam is situated on Cassey Brook and is regulated by the NHDES Dam Bureau, with state permitting, inspection, and enforcement in place to ensure its safety and compliance.
Despite its low hazard potential and satisfactory condition assessment as of October 2016, Tannery Pond Dam poses a moderate risk (rating of 3) according to the data provided. With a drainage area of 14.85 square miles and a maximum discharge of 1100 cubic feet per second, the dam's spillway type is uncontrolled. While no Emergency Action Plan (EAP) or inundation maps are noted, regular inspections every six years help to monitor the dam's integrity and safety measures, with the risk management measures currently unspecified.
Enthusiasts of water resources and climate may find Tannery Pond Dam a fascinating subject for study, given its historical significance, recreational purpose, and regulatory oversight. Its location in the Merrimack County of New Hampshire, along with its moderate risk assessment and management considerations, offer a compelling case for further exploration and monitoring in the realm of dam safety and environmental impact.
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 Tannery Pond Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Merrimack River At Franklin Junction | 6,760 cfs | → |
| Smith River Near Bristol | 257 cfs | → |
| Blackwater River Near Webster | 19 cfs | → |
| Warner River At Davisville | 527 cfs | → |
| Winnipesaukee River At Tilton | 1,590 cfs | → |
| Contoocook R Bl Hopkinton Dam At W Hopkinton | 1,690 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Tannery Pond Dam.
Boat launches
- Pleasant Lake Boat Launch
- Adder Pond Boat Launch
- Waukeena Lake Boat Launch
- Lake Avenue 51, Newbury
- Highland Lake Boat Launch
- School Pond Boat Launch
Campgrounds
- Camp Wilmot
- Northstar Campground
- Clark Brook Campsite
- Cardigan Campsites
- Mile-Away Campground
- Camp Spaulding
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 To Crossing Of Route 100 Near Route 155
- First Bridge Upstream On Route 100 To Confluence With West River
Track Tannery 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 Tannery Pond Dam
Where does the data for Tannery 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 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 Tannery Pond Dam.