Swan Lake Dam dam
Swan Lake Dam
Swan Lake Dam, located in Sullivan County, New York, was completed in 1894 and serves as a vital water resource for the area. With a primary purpose of recreation, this stone dam stands at a height of 31 feet and has a length of 135 feet, creating a reservoir with a storage capacity of 3,760 acre-feet. The dam is situated on the West Branch Mongaup River and is regulated by the New York State Department of Environmental Conservation.
Despite its age, Swan Lake Dam is in fair condition according to a 2013 assessment, with a significant hazard potential due to its location and structural characteristics. The dam is regularly inspected every four years, with the last inspection conducted in December 2018. The risk assessment for the dam indicates a very high risk level, emphasizing the importance of ongoing monitoring and maintenance to ensure the safety and stability of the structure.
Managed by a private owner, Swan Lake Dam plays a crucial role in providing recreational opportunities and water storage for the region. With its controlled spillway and significant storage capacity, the dam is a key feature in the local water infrastructure. As climate change impacts continue to affect water resources, the maintenance and safety of dams like Swan Lake Dam will be essential in safeguarding against potential risks and ensuring sustainable water management for the future.
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 Swan Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Mongaup River At Mongaup Valley Ny | 65 cfs | → |
| Neversink River At Neversink Ny | 108 cfs | → |
| Neversink River At Bridgeville Ny | 136 cfs | → |
| Neversink River Near Claryville Ny | 106 cfs | → |
| Chestnut Creek At Grahamsville Ny | 26 cfs | → |
| Delaware River At Callicoon Ny | 2,410 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Swan Lake Dam.
Track Swan 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 Swan Lake Dam
Where does the data for Swan 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 Swan Lake Dam.