Promise City Reservoir Dam Reservoir Report
Last Updated: December 7, 2025
Located in Promise City, Iowa, the Promise City Reservoir Dam stands as a vital water supply structure for the local community.
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Summary
Completed in 1900, this Earth-type dam reaches a height of 25 feet and spans 320 feet in length, with a storage capacity of 250 acre-feet. Situated on the TR-South Fork Chariton River, this dam is regulated by the Iowa Department of Natural Resources, ensuring its safety and compliance with state permitting and inspection requirements.
Despite its age, the Promise City Reservoir Dam has a low hazard potential and a moderate risk assessment rating. While it has not been rated for its current condition, this dam continues to serve its primary purpose of supplying water to the surrounding area. With a surface area of 8 acres and a drainage area of 0.05 square miles, this dam plays a crucial role in managing water resources and supporting the local ecosystem.
As water resource and climate enthusiasts explore the Promise City Reservoir Dam, they can appreciate its historical significance and ongoing contribution to the community. With its uncontrolled spillway and soil foundation, this dam exemplifies the importance of proper infrastructure for water management. Despite its age, this structure remains a key component of the local water supply system, highlighting the intersection of engineering, environmental stewardship, and community resilience in the face of changing climates and water demands.
Year Completed |
1900 |
Dam Length |
320 |
Dam Height |
25 |
River Or Stream |
TR-SOUTH FORK CHARITON RIVER |
Primary Dam Type |
Earth |
Surface Area |
8 |
Drainage Area |
0.05 |
Nid Storage |
250 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Promise City Reservoir Dam
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