Mirror Lake Dam dam
Mirror Lake Dam
Mirror Lake Dam, located in Woodstock, New Hampshire, was completed in 1836 and serves as a vital recreational resource for the area. With a height of 11.5 feet and a length of 290 feet, the dam holds a maximum storage capacity of 187 acre-feet, making it a significant feature along TR Hubbard Brook. Despite its historical significance, the dam has been assessed as being in poor condition with a high hazard potential, prompting concerns for its long-term safety and maintenance.
Managed by the NHDES Dam Bureau, Mirror Lake Dam is subject to state regulation, inspection, and enforcement to ensure its continued operation and safety. The dam's primary purpose is recreation, offering a serene surface area of 38 acres for visitors to enjoy. However, with a moderate risk assessment rating of 3, there is a need for ongoing risk management measures to address potential hazards and safeguard the surrounding community and environment. As climate change continues to impact water resources, the resilience and sustainability of Mirror Lake Dam will be crucial for preserving this important waterway for future generations.
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 Mirror Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Pemigewasset River At Woodstock | 687 cfs | → |
| East Branch Pemigewasset River At Lincoln | 465 cfs | → |
| Pemigewasset River At Plymouth | 1,900 cfs | → |
| Baker River Near Rumney | 367 cfs | → |
| Bearcamp River At South Tamworth | 198 cfs | → |
| Connecticut River At Wells River | 4,490 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mirror Lake Dam.
Boat launches
- Mirror Lake Boat Launch
- Stinson Lake Boat Launch
- Olivarian Road 99, Benton
- Oliverian Boating Site
- Armington Lake Boat Launch
- Lower Baker Pond Boat Launch
Campgrounds
- Koa Campground
- Waterest Campground
- Tripoli Rd
- Tripoli Road Camping Area
- Pemi River Campground
- Russell Pond
Paddle runs
- Woodstock/Thornton Town Line To Thornton Railroad Bridge
- Thornton Railroad Bridge To Bridgewater/Bristol Town Line
- Headwaters At Profile Lake To Southern Boundary Of Franconia Notch State Park
- Begins In Franklin To Sewall's Island
- Sewall's Island To Manchester Street Bridge
- Source Above Fr 55 To Proclamation Boundary (Stony Brook)
Track Mirror 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 Mirror Lake Dam
Where does the data for Mirror 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 Mirror Lake Dam.