Ischua Creek Watershed Dam #2 Reservoir Report
Last Updated: December 6, 2025
Ischua Creek Watershed Dam #2, located in Franklinville, New York, is a vital structure designed by the USDA NRCS to reduce flood risks in the area.
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Summary
Completed in 1961, this earth dam stands at a height of 42 feet and spans a length of 1400 feet, with a storage capacity of 647 acre-feet. The dam is situated on Johnson Creek and is regulated by the NYS DEC, with regular inspections ensuring its satisfactory condition and high hazard potential.
The dam's spillway, with a width of 160 feet, is uncontrolled, allowing for the discharge of up to 6591 cubic feet per second during peak flow events. The surrounding area has a drainage area of 2.8 square miles, with a surface area of 7 acres. In the event of an emergency, the dam's Emergency Action Plan (EAP) is in place, with a risk assessment categorizing the structure as having a moderate risk level. This critical infrastructure plays a crucial role in protecting the community from potential flooding events in the Ischua Creek Watershed.
Ischua Creek Watershed Dam #2 is a key flood risk reduction asset owned by the local government and managed by the Natural Resources Conservation Service. With its strategic location and effective design, this dam serves as a vital component of the region's water resource and climate management efforts. As water resource and climate enthusiasts, understanding and supporting the maintenance and operation of such essential structures is paramount to safeguarding communities and ecosystems in the face of changing environmental conditions.
Year Completed |
1961 |
Dam Length |
1400 |
Dam Height |
42 |
River Or Stream |
JOHNSON CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Drainage Area |
2.8 |
Nid Storage |
647 |
Hazard Potential |
High |
Nid Height |
42 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Allegheny River At Salamanca Ny
|
1540cfs |
Genesee River At Portageville Ny
|
542cfs |
Cattaraugus Creek At Gowanda Ny
|
490cfs |
Oatka Creek At Warsaw Ny
|
27cfs |
Allegheny River At Eldred
|
473cfs |
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 #2