Ischua Creek Watershed Dam #6a Reservoir Report
Last Updated: December 6, 2025
Ischua Creek Watershed Dam #6a, also known as Case Lake, is a vital structure located in Franklinville, Cattaraugus County, New York.
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Summary
Built in 1971 by the USDA NRCS, this earth dam stands at a height of 63 feet and serves the primary purpose of flood risk reduction. With a storage capacity of 3,890 acre-feet and a drainage area of 19 square miles, this dam plays a crucial role in managing water flow and protecting the surrounding area from potential flooding.
Managed by local government authorities and regulated by the NYS DEC, Ischua Creek Watershed Dam #6a has a high hazard potential but is currently in satisfactory condition, as assessed in January 2021. Its uncontrolled spillway, with a width of 488 feet, can handle a maximum discharge of 35,800 cubic feet per second. Despite its moderate risk assessment rating, the dam has not been modified in recent years and undergoes regular inspections to ensure its continued safety and effectiveness in flood risk reduction. For water resource and climate enthusiasts, this dam serves as a significant infrastructure for both flood management and recreational activities in the area.
Year Completed |
1971 |
Dam Length |
1043 |
Dam Height |
63 |
River Or Stream |
GATES CREEK |
Primary Dam Type |
Earth |
Surface Area |
80 |
Drainage Area |
19 |
Nid Storage |
3890 |
Hazard Potential |
High |
Nid Height |
63 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Allegheny River At Salamanca Ny
|
1540cfs |
Allegheny River At Eldred
|
473cfs |
Genesee River At Portageville Ny
|
542cfs |
Cattaraugus Creek At Gowanda Ny
|
490cfs |
Oswayo Creek At Shinglehouse
|
60cfs |
Genesee River At Wellsville Ny
|
136cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
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. Investigations and studies are necessary.
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.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams 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, environment 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.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Ischua Creek Watershed Dam #6a