Iowa Noname70 Reservoir Report
Nearby: Willow Lake Dam Ganzhorn Dam
Last Updated: December 13, 2025
Iowa Noname70 is a local government-owned dam located in Harrison County, Iowa, along the TR-WILLOW CREEK.
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Summary
Built in 1976 by DESIGN ENGINEERING, INC, this earth dam stands at a height of 31 feet and serves primarily for debris control. With a storage capacity of 43 acre-feet, the dam covers a surface area of 22 acres and has a drainage area of 0.2 square miles.
Managed by the Iowa Department of Natural Resources, Iowa Noname70 is regulated, permitted, inspected, and enforced by the state. Despite its low hazard potential, the dam is rated as having a moderate risk level (3) and its condition remains unrated. While no emergency action plan is currently in place, the structure meets state guidelines and is subject to periodic risk assessments.
Water resource and climate enthusiasts can appreciate Iowa Noname70 for its role in debris control along TR-WILLOW CREEK. With its earth construction and soil foundation, this dam provides essential recreational opportunities while serving as a vital component of the local water infrastructure in Missouri Valley. As efforts continue to manage and mitigate potential risks, the dam remains a key feature in ensuring the safety and sustainability of water resources in the region.
Year Completed |
1976 |
Dam Length |
260 |
Dam Height |
31 |
River Or Stream |
TR-WILLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
22 |
Drainage Area |
0.2 |
Nid Storage |
43 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Soldier River At Pisgah
|
112cfs |
Boyer River At Logan
|
417cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Maple River At Mapleton
|
323cfs |
Missouri River At Decatur
|
15500cfs |
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.
Iowa Noname70