Clark Dam Reservoir Report
Nearby: Korn Dam Martins Dam
Last Updated: December 14, 2025
Clark Dam, located in Vail, Iowa, was completed in 2004 by the NRCS and serves multiple purposes including fire protection, stock, and small fish pond.
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Summary
The earth dam stands at 28 feet high and stretches 540 feet in length, with a storage capacity of 147 acre-feet. Situated on the TR-East Boyer River, the dam is under the jurisdiction of the Iowa Department of Natural Resources and is regulated, inspected, and enforced by state authorities.
With a low hazard potential and a moderate risk assessment rating, Clark Dam plays a crucial role in water resource management in Crawford County, Iowa. The dam's uncontrolled spillway, with a width of 3 feet, ensures effective water discharge during high flow events. Despite being privately owned, the dam is state-regulated and regularly inspected to ensure its structural integrity and operational efficiency. Enthusiasts of water resources and climate will find Clark Dam to be a fascinating example of sustainable water management practices in the region.
Year Completed |
2004 |
Dam Length |
540 |
Dam Height |
28 |
River Or Stream |
TR- EAST BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
13.6 |
Drainage Area |
0.51 |
Nid Storage |
147 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Raccoon River Near Sac City
|
312cfs |
Maple River At Mapleton
|
323cfs |
Middle Raccoon River Near Bayard
|
121cfs |
North Raccoon River Near Jefferson
|
530cfs |
Little Sioux River At Correctionville
|
327cfs |
Little Sioux River Near Turin
|
1040cfs |
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.
Clark Dam