Mountain Lake Dam dam
Mountain Lake Dam
Mountain Lake Dam, located in Lewbeach, New York, is a privately owned structure with a primary purpose of recreation. The earth-type dam, completed in 1930, stands at 15 feet high and spans a length of 500 feet, with a storage capacity of 118 acre-feet. Situated on the TR-BIG POND river or stream, the dam features a controlled spillway with a width of 20 feet and has a low hazard potential rating. Despite not being rated for condition assessment, the dam has undergone state regulation, permitting, inspection, and enforcement, ensuring its safety and compliance with standards.
The dam's risk assessment categorizes it as having a very high risk level, emphasizing the need for effective risk management measures. Although the last inspection dates back to 1996, the dam's emergency action plan status, inundation maps, and compliance with guidelines remain unclear. With a maximum discharge capacity of 240 cubic feet per second, the dam serves as a vital recreational resource in Delaware County, offering a surface area of 19 acres for various activities. Even though it is not federally owned or funded, the Mountain Lake Dam plays a crucial role in water resource management and climate preservation efforts in the region.
In the realm of water resource and climate conservation, Mountain Lake Dam's significance lies in its role as a recreational asset with controlled water management capabilities. As a privately owned structure regulated by the NYS DEC, the dam is vital for both local residents and visitors seeking outdoor activities. With its low hazard potential and a history dating back to the early 20th century, the dam stands as a testament to sustainable infrastructure development and the need for ongoing risk assessment and management practices in the face of evolving climate challenges.
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 Mountain Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Mill Brook Near Dunraven Ny | 40 cfs | → |
| Platte Kill At Dunraven Ny | 42 cfs | → |
| Tremper Kill Near Andes Ny | 32 cfs | → |
| East Br Delaware R At Margaretville Ny | 175 cfs | → |
| Dry Brook At Arkville | 122 cfs | → |
| Bush Kill Near Arkville Ny | 65 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mountain Lake Dam.
Boat launches
- Bureau Of Water Supply Road 3 Town Of Andes
- Nyc 4 Road Town Of Andes
- State Highway 55a Town Of Wawarsing
- Loop A Town Of Woodstock
- Delaware River
- Callicoon
Track Mountain 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 Mountain Lake Dam
Where does the data for Mountain 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 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 Mountain Lake Dam.