Harmony Creek Watershed Site 6 Reservoir Report
Last Updated: December 14, 2025
Harmony Creek Watershed Site 6, located in Missouri Valley, Iowa, is a key water resource managed by the local government.
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Summary
This site, designed by the USDA NRCS, serves multiple purposes including fire protection, stock, and small fish pond maintenance, as well as flood risk reduction. The earth dam, completed in 1958, stands at a height of 45 feet and spans 660 feet, with a maximum storage capacity of 210 acre-feet.
The dam, regulated by the Iowa DNR, has a low hazard potential and a moderate risk assessment rating of 3. While the condition assessment is not rated, the last inspection conducted in 1965 showed no significant issues. The site covers a surface area of 5 acres and drains a 0.34 square mile watershed area, making it a crucial component in managing water resources in the region.
With its strategic location along Harmony Creek and its role in mitigating flood risks, Harmony Creek Watershed Site 6 is a vital infrastructure for water resource and climate enthusiasts. Its efficient design, low hazard potential, and moderate risk assessment demonstrate its importance in safeguarding the surrounding environment and communities. As efforts continue to maintain and monitor the site, it serves as a model for sustainable water resource management practices in Iowa.
Year Completed |
1958 |
Dam Length |
660 |
Dam Height |
45 |
River Or Stream |
HARMONY CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.34 |
Nid Storage |
210 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
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