Evans Dam dam
Evans Dam
Evans Dam, located in Sullivan, New York, along the Sheldrake Stream, was completed in 1900 for the primary purpose of recreation. This private earth dam has a height of 10 feet and a length of 1947 feet, providing a storage capacity of 112 acre-feet. Although it does not have a spillway, it has a spillway width of 100 feet and a maximum discharge of 770 cubic feet per second.
With a significant hazard potential and a high risk assessment rating of 2, Evans Dam is state-regulated by the New York State Department of Environmental Conservation. It undergoes regular state inspections and enforcement to ensure its safety and compliance with regulations. While the dam's condition assessment is currently not rated, its last inspection date was in December 2018, with inspections scheduled every four years.
For water resource and climate enthusiasts, Evans Dam presents an intriguing case study of a century-old structure that continues to serve its recreational purpose while facing significant risk factors that require ongoing monitoring and management. Its location, design, and regulatory oversight provide valuable insights into the complexities of dam infrastructure in the context of evolving environmental and safety considerations.
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 Evans Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Neversink River At Neversink Ny | 108 cfs | → |
| Chestnut Creek At Grahamsville Ny | 26 cfs | → |
| Neversink River At Bridgeville Ny | 136 cfs | → |
| Mongaup River At Mongaup Valley Ny | 65 cfs | → |
| Neversink River Near Claryville Ny | 106 cfs | → |
| Rondout Creek Near Lowes Corners Ny | 48 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Evans Dam.
Boat launches
- State Highway 55a Town Of Wawarsing
- Starlight Road 55, Monticello
- Plank Road Town Of Forestburgh
- Town Of Mamakating
- Butler Court Town Of Mamakating
- Callicoon
Track Evans 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 Evans Dam
Where does the data for Evans 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 Evans Dam.