Moulton Watershed Site A-1 Reservoir Report
Last Updated: December 7, 2025
Moulton Watershed Site A-1, located in Coal City, Iowa, is a crucial flood risk reduction infrastructure managed by the local government.
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Summary
Built in 1968, this earth dam stands at a height of 31 feet and spans a length of 970 feet, providing essential protection to the surrounding area along the TR-Chariton River. With a storage capacity of 1,126 acre-feet and a drainage area of 4.88 square miles, this site plays a vital role in mitigating potential flooding events and safeguarding the community.
Managed by the Iowa Department of Natural Resources, Moulton Watershed Site A-1 is classified as having a low hazard potential, with a satisfactory condition assessment as of August 2016. Despite its moderate risk assessment rating, the dam has been deemed to meet safety guidelines and is regularly inspected for maintenance and compliance. The site's uncontrolled spillway, with a width of 4 feet, ensures proper water flow management during high water events, further reducing the risk of flooding in the area.
For water resource and climate enthusiasts, Moulton Watershed Site A-1 serves as a prime example of effective flood risk reduction infrastructure in the heart of Iowa. With its strategic design and efficient operation, this earth dam not only protects the surrounding community but also contributes to the overall resilience of the region in the face of changing climate patterns. As a key component of the local government's flood protection strategy, this site showcases the importance of proactive measures in safeguarding water resources and enhancing climate adaptation efforts.
Year Completed |
1968 |
Dam Length |
970 |
Dam Height |
31 |
River Or Stream |
TR-CHARITON RIVER |
Primary Dam Type |
Earth |
Surface Area |
44 |
Drainage Area |
4.88 |
Nid Storage |
1126 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
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.
Moulton Watershed Site A-1