Harmony Creek Watershed Site 1 Reservoir Report
Last Updated: December 14, 2025
Harmony Creek Watershed Site 1, located in Harrison County, Iowa, is a vital earth dam completed in 1958 for multiple purposes including fire protection, stock maintenance, and small fish pond establishment.
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Summary
Managed by the local government and designed by USDA NRCS, this dam serves as a key feature on Harmony Creek, with a maximum storage capacity of 755 acre-feet and a drainage area of 4.46 square miles. The dam's low hazard potential and moderate risk assessment make it a critical infrastructure for flood risk reduction in the region.
With a structural height of 43 feet and a length of 758 feet, Harmony Creek Watershed Site 1 has a surface area of 32.4 acres and a normal storage capacity of 390 acre-feet. The dam's uncontrolled spillway type and soil foundation reflect its design for efficient water management and protection against potential hazards. Although the dam's condition assessment is currently not rated, its state-regulated status and compliance with inspection, permitting, and enforcement requirements by the Iowa DNR ensure its operational effectiveness and safety standards for the community and the environment.
Year Completed |
1958 |
Dam Length |
758 |
Dam Height |
43 |
River Or Stream |
HARMONY CREEK |
Primary Dam Type |
Earth |
Surface Area |
32.4 |
Drainage Area |
4.46 |
Nid Storage |
755 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
43 |
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 1