Dan Hole River Dam dam
Dan Hole River Dam
Located in Ossipee, New Hampshire, the Dan Hole River Dam, also known as Mill Pond Dam, is a concrete buttress structure completed in 1935 for the primary purpose of recreation. With a height of 29 feet and a length of 140 feet, this dam impounds the Dan Hole River, creating a reservoir with a storage capacity of 68 acre-feet and a surface area of 6 acres. Despite its age, the dam is still actively regulated, permitted, inspected, and enforced by the New Hampshire Department of Environmental Services Dam Bureau, ensuring its safety and compliance with state regulations.
The dam's hazard potential is classified as significant, with a poor condition assessment as of October 2014. Its emergency action plan (EAP) status is currently unspecified, with the last revision in February 2020. The risk assessment for the dam is moderate (3), indicating a level of risk that requires attention and management. Overall, the Dan Hole River Dam serves as a vital infrastructure for recreation and water resource management in the area, highlighting the importance of ongoing maintenance and risk mitigation efforts to ensure its continued safety and functionality for the community and the environment.
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 Dan Hole River Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Bearcamp River At South Tamworth | 198 cfs | → |
| Saco River Near Conway | 1,580 cfs | → |
| Saco River At Cornish | 7,900 cfs | → |
| Pemigewasset River At Plymouth | 1,900 cfs | → |
| Pemigewasset River At Woodstock | 687 cfs | → |
| Winnipesaukee River At Tilton | 1,590 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Dan Hole River Dam.
Boat launches
- Pine River Boat Launch
- Duncan Lake Boat Launch
- White Pond Boat Launch
- Ossipee River Boat Launch
- Lake Winnipesaukee Boat Launch
- Eaton Road 2984, Eaton
Campgrounds
Paddle runs
- Thornton Railroad Bridge To Bridgewater/Bristol Town Line
- Woodstock/Thornton Town Line To Thornton Railroad Bridge
- Begins In Franklin To Sewall's Island
- Headwaters At Profile Lake To Southern Boundary Of Franconia Notch State Park
- Sewall's Island To Manchester Street Bridge
Track Dan Hole River 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 Dan Hole River Dam
Where does the data for Dan Hole River 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 Dan Hole River Dam.