Long Sault dam
Long Sault
Long Sault is a concrete gravity dam located on the St. Lawrence River in Cornwall, New York. Completed in 1958, this hydroelectric structure stands at 104 feet in height and has a hydraulic height of 81 feet, with a structural height of 132 feet. The dam's primary purpose is for hydroelectric power generation and navigation, making it a crucial infrastructure for water resource management in the area.
With a normal storage capacity of 750,000 acre-feet and a maximum discharge of 1,250,000 cubic feet per second, Long Sault plays a significant role in regulating water flow and providing renewable energy to the region. The dam has a high hazard potential, emphasizing the importance of regular inspections and emergency preparedness. Although the condition assessment is not available, the Federal Energy Regulatory Commission oversees the dam's operations and inspections to ensure its safety and reliability.
Overall, Long Sault serves as a vital component of the water resource infrastructure in New York, contributing to water management, energy generation, and navigation along the St. Lawrence River. As a concrete multi-arch dam with a controlled spillway, it represents a key asset for climate enthusiasts and water resource professionals alike, highlighting the intersection of sustainable energy production and environmental stewardship in the region.
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 Long Sault -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| St. Regis River At Brasher Center Ny | 1,150 cfs | → |
| Raquette River At Raymondville Ny | 2,050 cfs | → |
| Grass River At Chase Mills Ny | 992 cfs | → |
| Little Salmon River At Bombay Ny | 114 cfs | → |
| W Br St. Regis R Nr Parishville Ny | 362 cfs | → |
| Raquette River At South Colton Ny | 1,050 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Long Sault .
Boat launches
- Long Sault Parkway 15702, Long Sault
- Long Sault Parkway 15417, Ingleside
- Ny 131 Saint Lawrence County
- Water Street West Cornwall
- Wilson Hill Causeway Saint Lawrence County
- St Regis River
Track Long Sault 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 Long Sault
Where does the data for Long Sault 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 High 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 Long Sault .