Woodbury County Roadgrade Dam 36-86-42 Reservoir Report
Nearby: Lingren Dam #3 Ls Dennis Lindgren 2
Last Updated: December 14, 2025
Woodbury County Roadgrade Dam 36-86-42, located in Danbury, Iowa, is a crucial structure owned by the local government and regulated by the Iowa Department of Natural Resources.
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Summary
Completed in 1990, this earth dam stands at a height of 42 feet and stretches over 1000 feet in length, with a storage capacity of 540 acre-feet. The dam serves various purposes, including flood control and water resource management, particularly on the TR-Maple River.
With a significant hazard potential and a satisfactory condition assessment, Woodbury County Roadgrade Dam 36-86-42 plays a vital role in mitigating risks associated with potential flooding events in the region. The dam features an uncontrolled spillway with a width of 8 feet and undergoes regular inspections every five years to ensure its structural integrity and functionality. Despite its moderate risk assessment, the dam's risk management measures are not explicitly outlined, indicating a potential area for improvement in emergency preparedness and response protocols.
Year Completed |
1990 |
Dam Length |
1000 |
Dam Height |
42 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
1 |
Nid Storage |
540 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
42 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River At Correctionville
|
327cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Soldier River At Pisgah
|
112cfs |
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.
Woodbury County Roadgrade Dam 36-86-42