Crawford County Roadgrade Dam 27-83-38 Reservoir Report
Last Updated: December 15, 2025
Crawford County Roadgrade Dam 27-83-38, located in Denison, Iowa, is a local government-owned structure designed by the NRCS for fire protection, stock, or small fish pond purposes.
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Summary
Completed in 2000, this earth dam stands at a height of 39 feet and has a length of 830 feet. It boasts a normal storage capacity of 18 acre-feet and a maximum storage of 85 acre-feet, serving as a vital resource for the community.
Situated on TR-Walnut Creek, this dam plays a crucial role in water management and conservation efforts in Crawford County. With a low hazard potential and a moderate risk assessment rating, it is regulated, permitted, inspected, and enforced by the Iowa DNR. Despite its uncontrolled spillway type, the structure has not been rated for condition assessment, and emergency action plans are yet to be prepared.
Water resource and climate enthusiasts will be fascinated by the strategic location and purpose of Crawford County Roadgrade Dam 27-83-38. As a key feature in the local landscape, this dam serves as a valuable asset for fire protection and agricultural activities, highlighting the importance of sustainable water infrastructure in mitigating risks and promoting community resilience.
Year Completed |
2000 |
Dam Length |
830 |
Dam Height |
39 |
River Or Stream |
TR- WALNUT CREEK |
Primary Dam Type |
Earth |
Surface Area |
3.3 |
Drainage Area |
0.35 |
Nid Storage |
85 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Raccoon River Near Sac City
|
312cfs |
Maple River At Mapleton
|
323cfs |
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
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.
Crawford County Roadgrade Dam 27-83-38