Dimmitt Dam Reservoir Report
Nearby: Anderson Dam Loch Burns Dam
Last Updated: December 6, 2025
Dimmitt Dam, located in Wapello County, Iowa, is a privately owned structure with a primary purpose of serving as a fire protection, stock, or small fish pond.
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Summary
Built in 1965 by the USDA NRCS, this earth dam stands at a height of 20 feet and stretches 431 feet in length, with a storage capacity of 78 acre-feet. The dam, situated on TR-Cedar Creek, is regulated by the Iowa DNR and is designed to withstand low hazard potential.
Despite its relatively low hazard potential, Dimmitt Dam poses a moderate risk, with a risk assessment rating of 3. The dam has not been rated for its condition assessment, and the last inspection took place in January 1990. While the dam does not have outlet gates or locks, it features an uncontrolled spillway. The surrounding area covers 4.7 acres, with a drainage area of 0.51 square miles, making it a key resource for water conservation in the region. Enthusiasts of water resources and climate will find Dimmitt Dam a notable structure for its historic significance and ecological impact in the area.
Year Completed |
1965 |
Dam Length |
431 |
Dam Height |
20 |
River Or Stream |
TR-CEDAR CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.7 |
Drainage Area |
0.51 |
Nid Storage |
78 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Des Moines River At Ottumwa
|
1090cfs |
North Skunk River Near Sigourney
|
97cfs |
Fox River At Bloomfield
|
7cfs |
South Skunk River Near Oskaloosa
|
485cfs |
Des Moines River At Keosauqua
|
1800cfs |
Des Moines River Near Tracy
|
1400cfs |
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.
Dimmitt Dam