Diede Dam Reservoir Report
Last Updated: December 13, 2025
Diede Dam, located in Sioux City, Iowa, is a privately owned earth dam primarily used for fire protection, stock, and as a small fish pond.
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Summary
Built in 1999 by the NRCS, this dam stands at 27 feet high and stretches 490 feet in length, with a storage capacity of 116 acre-feet. The dam sits on the TR-Floyd River and is regulated by the Iowa DNR, with state permitting, inspection, and enforcement in place to ensure its safety and compliance.
With a low hazard potential and a moderate risk assessment rating, Diede Dam serves as an important water resource structure in Plymouth County, Iowa. The dam's condition is currently not rated, but it meets state regulatory requirements and has a history of regular inspections. Despite its remote location and limited drainage area of 0.68 square miles, Diede Dam plays a crucial role in providing water for various purposes in the region, showcasing the intersection of water resource management and climate resilience in the heart of the Midwest.
Year Completed |
1999 |
Dam Length |
490 |
Dam Height |
27 |
River Or Stream |
TR- FLOYD RIVER |
Primary Dam Type |
Earth |
Surface Area |
8.3 |
Drainage Area |
0.68 |
Nid Storage |
116 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Floyd River At James
|
187cfs |
Missouri River At Sioux City
|
15100cfs |
Perry Creek Near Milnerville
|
25cfs |
Omaha Cr At Homer
|
45cfs |
Big Sioux River At Akron
|
816cfs |
Little Sioux River At Correctionville
|
327cfs |
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.
Diede Dam