Tennanah Lake Dam dam
Tennanah Lake Dam
Tennanah Lake Dam, located in Sullivan County, New York, stands as a testament to the importance of water resource management and climate resilience. Built in 1914, this concrete dam serves primarily for recreational purposes, offering a serene backdrop for visitors to Tennanah Lake. With a height of 17 feet and a length of 41 feet, the dam plays a crucial role in regulating the flow of Trout Brook and maintaining the surrounding ecosystem.
Despite its age, Tennanah Lake Dam remains in good condition, with regular inspections conducted by the New York State Department of Environmental Conservation. With a significant hazard potential and a high-risk assessment rating, the dam is closely monitored to ensure its structural integrity and the safety of nearby residents and recreational users. Although the spillway type is listed as "None," the dam is equipped with outlet gates for controlled water release in case of emergency.
As climate change continues to impact water resources and infrastructure, the importance of maintaining and upgrading dams like Tennanah Lake Dam becomes increasingly evident. With proper risk management measures in place and a dedication to ongoing maintenance and inspection, this dam serves as a vital component in safeguarding the surrounding community and natural environment against potential water-related hazards.
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 Tennanah Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Beaver Kill At Cooks Falls Ny | 409 cfs | → |
| Delaware River At Callicoon Ny | 2,410 cfs | → |
| East Br Delaware R At Fishs Eddy Ny | 871 cfs | → |
| East Br Delaware River At Harvard Ny | 351 cfs | → |
| Delaware River At Lordville Ny | 1,980 cfs | → |
| East Branch Delaware River At Downsville Ny | 229 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Tennanah Lake Dam.
Track Tennanah 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 Tennanah Lake Dam
Where does the data for Tennanah 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 Tennanah Lake Dam.