Mohawk Dam Reservoir Report
Last Updated: December 5, 2025
Mohawk Dam, located in Coshocton, Ohio, along the Walhonding River, is a rockfill dam completed in 1937 by the US Army Corps of Engineers.
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Summary
With a hydraulic height of 105 feet and a structural height of 111 feet, the dam serves a primary purpose of flood risk reduction with a storage capacity of 285,000 acre-feet. Despite being categorized as a high hazard potential dam, recent modifications and routine inspections have increased its reliability, making it a moderate risk dam among the USACE's more than 700 dams.
To manage the remaining risks associated with Mohawk Dam, the USACE implements a comprehensive risk management program. This includes continuous operations and maintenance activities, detailed inspections during normal and flood conditions, specialized instrumentation for monitoring, and an Interim Risk Reduction Measures Plan (IRRMP) for targeted risk mitigation. The dam's Emergency Action Plan is regularly updated, and emergency response actions are practiced through exercises and training with local and state emergency responders. These measures aim to reduce economic, environmental, and life risks to the downstream communities, ensuring the safety and resilience of the Mohawk Dam in the face of changing climate conditions.
Year Completed |
1937 |
Dam Length |
2330 |
River Or Stream |
WALHONDING RIVER |
Primary Dam Type |
Rockfill |
Hydraulic Height |
105 |
Drainage Area |
1504 |
Nid Storage |
285000 |
Structural Height |
111 |
Outlet Gates |
Slide (sluice gate) - 6 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
111 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Mohawk Dam