Marshall Dam Reservoir Report
Last Updated: December 13, 2025
Marshall Dam, located in Montgomery County, Iowa, is a privately owned earth dam that was completed in 1989 for multiple purposes including fire protection, stock, and small fish pond.
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Summary
With a height of 33 feet and a length of 230 feet, the dam has a storage capacity of 45 acre-feet and a surface area of 2.6 acres. Situated on the TR-Nodaway River, the dam is regulated by the Iowa Department of Natural Resources and is subject to state permitting, inspection, and enforcement.
Despite being classified as having a low hazard potential, Marshall Dam is considered to have a moderate risk level due to its condition being "Not Rated". The dam features an uncontrolled spillway type and has not been modified since its construction. While the dam does not have outlet gates or associated structures, it serves as a crucial resource for fire protection and aquatic life support in the area. With its strategic location and design by the USDA NRCS, Marshall Dam stands as a vital water resource for the community of Villisca and beyond.
Water resource and climate enthusiasts will appreciate the ecological significance of Marshall Dam, as it provides essential water storage and habitat for local wildlife. The dam's moderate risk level underscores the importance of ongoing maintenance and monitoring to ensure its continued safety and functionality. With its low hazard potential and regulated status, Marshall Dam serves as a model for responsible dam construction and management in Iowa, showcasing the vital role that infrastructure plays in supporting both human and environmental needs in a changing climate.
Year Completed |
1989 |
Dam Length |
230 |
Dam Height |
33 |
River Or Stream |
TR- NODAWAY RIVER |
Primary Dam Type |
Earth |
Surface Area |
2.6 |
Drainage Area |
0.2 |
Nid Storage |
45 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Viking Lake State Park Campground
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Viking Lake State Park
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Hacklebarney Woods County Park
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Legion City Park
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Pilot Grove Co Park
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Marshall Dam