Millen Lake Dam dam
Millen Lake Dam
Millen Lake Dam, located in Washington, New Hampshire, is a privately owned earth dam built in 1970 primarily for recreational purposes. Standing at 23 feet high and stretching 115 feet in length, this dam holds a storage capacity of 1,348 acre-feet and serves as a vital component of the local landscape. Situated on the TR Ashuelot River, the dam's uncontrolled spillway with a width of 5 feet ensures proper water flow management.
Despite its significant hazard potential, Millen Lake Dam has been deemed to be in satisfactory condition as of the last assessment in August 2015, with regular inspections conducted every four years. The dam's emergency action plan is being regularly updated and assessed for compliance with guidelines. With a moderate risk assessment rating of 3, the dam's risk management measures are continuously monitored to ensure the safety of the surrounding community and environment. For water resource and climate enthusiasts, Millen Lake Dam presents an interesting case study of dam infrastructure in a recreational setting within the picturesque Sullivan County, 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 Millen Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| North Branch River Near Antrim | 61 cfs | → |
| Ashuelot River Near Gilsum | 126 cfs | → |
| Contoocook River Near Henniker | 782 cfs | → |
| Ashuelot River Below Surry Mt Dam | 259 cfs | → |
| Otter Brook Below Otter Brook Dam | 12 cfs | → |
| Connecticut River At North Walpole | 11,900 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Millen Lake Dam.
Boat launches
- Millen Lake Boat Launch
- Ashuelot Pond Boat Launch
- Long Pond Boat Launch
- Sand Pond Boat Launch
- Halfmoon Pond Boat Launch
- Island Pond Boat Launch
Campgrounds
- Fox Brook Tent Site
- Northstar Campground
- Wheelock Park Campground
- Mile-Away Campground
- Tree Farm Campground
- Camp Wanocksett
Paddle runs
- Sewall's Island To Manchester Street Bridge
- Begins In Franklin To Sewall's Island
- First Bridge Upstream On Route 100 To Confluence With West River
- Headwaters To First Bridge Upstream On Route 100
- Headwaters To Crossing Of Route 100 Near Route 155
- Headwaters To Confluence With West River (End Of Sherman Road)
Track Millen 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 Millen Lake Dam
Where does the data for Millen 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 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 Millen Lake Dam.