Harmony Creek Watershed Site 7 Reservoir Report
Nearby: Harmony Creek Watershed Site 5
Last Updated: December 14, 2025
Harmony Creek Watershed Site 7, located in Harrison, Iowa, is a crucial water management structure owned by the local government with oversight by the Iowa Department of Natural Resources.
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Summary
Designed by the USDA NRCS and completed in 1958, this earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a maximum storage capacity of 199 acre-feet and a surface area of 7.8 acres, the dam plays a vital role in managing water resources in the region.
The dam, standing at a height of 40 feet and spanning a length of 430 feet, is equipped with an uncontrolled spillway and has a low hazard potential according to its risk assessment. Although the condition assessment is currently not rated, the dam is subject to state regulation, permitting, inspection, and enforcement. Despite its moderate risk level, the dam at Harmony Creek Watershed Site 7 continues to serve as a key infrastructure for water resource management in the area, demonstrating the importance of sustainable practices in climate adaptation and resilience.
As water resource and climate enthusiasts, understanding and monitoring the condition and management of structures like Harmony Creek Watershed Site 7 is essential for ensuring the sustainability and resilience of our water systems. By recognizing the critical role of this dam in flood risk reduction and water storage, we can appreciate the efforts of local government and regulatory agencies in safeguarding our communities against potential hazards and ensuring the long-term viability of our water resources.
Year Completed |
1958 |
Dam Length |
430 |
Dam Height |
40 |
River Or Stream |
HARMONY CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.8 |
Drainage Area |
0.71 |
Nid Storage |
199 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
40 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
West Nishnabotna River At Hancock
|
154cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Omaha
|
17500cfs |
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.
Harmony Creek Watershed Site 6