Willow Marsh Dam Reservoir Report
Last Updated: December 13, 2025
Willow Marsh Dam, located in Posey County, Indiana, is a state-owned earth dam primarily used for recreation purposes.
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Summary
Standing at a height of 10 feet and stretching 600 feet in length, the dam provides storage of 75 acre-feet of water for its surrounding area. Despite its low hazard potential and current "Not Rated" condition assessment, the dam has not been inspected since January 1990.
With its picturesque setting and ample storage capacity, Willow Marsh Dam serves as a vital resource for the local community. Although it is not currently regulated or inspected by the state, the dam's importance for recreation and water storage cannot be understated. As water resource and climate enthusiasts, it is crucial to monitor and ensure the safety and maintenance of this structure to guarantee its continued functionality and benefit to the region.
Dam Length |
600 |
Dam Height |
10 |
Primary Dam Type |
Earth |
Drainage Area |
0.22 |
Nid Storage |
75 |
Hazard Potential |
Low |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Ohio River At Old Shawneetown
|
259000cfs |
Big Creek Near Wadesville
|
1cfs |
Little Wabash River At Carmi
|
117cfs |
Wabash River At New Harmony
|
6520cfs |
Pigeon Creek Near Fort Branch
|
5cfs |
Bonpas Creek At Browns
|
0cfs |
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.
Willow Marsh Dam