Flat Rock dam
Flat Rock
Flat Rock is a captivating hydroelectric dam located on the East Branch Oswegatchie River in St. Lawrence, New York. Constructed in 1925, this concrete structure stands at a height of 67 feet and has a hydraulic height of 72 feet, providing a storage capacity of 3382 acre-feet. With a spillway width of 229 feet and a maximum discharge of 12000 cubic feet per second, Flat Rock ensures efficient water management in its surrounding area.
Managed by the Federal Energy Regulatory Commission, Flat Rock is a vital piece of infrastructure for the region, offering renewable energy generation and flood control capabilities. Despite its high hazard potential, the dam is regularly inspected to ensure its structural integrity and safe operation. Additionally, the dam has an emergency action plan in place, meeting established guidelines to mitigate risks and manage potential emergencies effectively. Overall, Flat Rock serves as a key player in water resource management and climate resilience efforts in the area.
With its historical significance and modern functionality, Flat Rock exemplifies the intersection of traditional dam engineering and contemporary hydroelectric technology. As a critical component of the local water infrastructure, this dam plays a crucial role in supporting the region's energy needs and environmental sustainability goals. As water resource and climate enthusiasts, we appreciate the importance of structures like Flat Rock in harnessing the power of water for both human benefit and ecological harmony.
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 Flat Rock -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Oswegatchie River Near Oswegatchie Ny | 832 cfs | → |
| West Branch Oswegatchie R Nr Harrisville Ny | 633 cfs | → |
| Raquette River At South Colton Ny | 1,050 cfs | → |
| Raquette River At Piercefield Ny | 2,020 cfs | → |
| Beaver River At Croghan Ny | 893 cfs | → |
| Oswegatchie River Near Heuvelton Ny | 2,030 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Flat Rock .
Boat launches
Campgrounds
Track Flat Rock 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 Flat Rock
Where does the data for Flat Rock 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 Flat Rock .