Idot Roadgrade Dam 7-88-47 Reservoir Report
Last Updated: December 13, 2025
Idot Roadgrade Dam 7-88-47, located in Woodbury County, Iowa, serves multiple purposes including fire protection, stock maintenance, and small fish pond management.
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Summary
Built in 1979, this earth dam stands at a height of 25 feet and spans a length of 328 feet, providing a storage capacity of 117 acre-feet. Despite its modest size, the dam plays a crucial role in regulating the flow of the Missouri River and supporting the surrounding ecosystem.
Managed by the Iowa Department of Natural Resources, this dam is classified as having a low hazard potential with a moderate risk assessment. While it has not been formally rated for its condition, regular inspections and state regulatory oversight ensure that it remains in compliance with safety standards. The dam's location within the Omaha District of the US Army Corps of Engineers underscores its importance in water resource management in the region.
As climate change continues to impact water resources and infrastructure, the maintenance and monitoring of dams like Idot Roadgrade Dam 7-88-47 become increasingly critical. By providing essential services for both agricultural and ecological purposes, this dam exemplifies the intersection of human development and environmental stewardship in the face of a changing climate.
Year Completed |
1979 |
Dam Length |
328 |
Dam Height |
25 |
River Or Stream |
TR-MISSOURI RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.59 |
Nid Storage |
117 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River At Sioux City
|
15100cfs |
Floyd River At James
|
187cfs |
Omaha Cr At Homer
|
45cfs |
Perry Creek Near Milnerville
|
25cfs |
West Fork Ditch At Hornick
|
80cfs |
South Omaha Creek At Walthill
|
11cfs |
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.
Idot Roadgrade Dam 7-88-47
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