Dory Dam Reservoir Report
Last Updated: December 12, 2025
Dory Dam in Afton, Iowa is a privately owned structure that serves multiple purposes including fire protection, stock containment, and small fish pond management.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1985, this earth dam stands at a height of 22 feet and spans a length of 460 feet, with a storage capacity of 82 acre-feet. Situated on the TR-Twelvemile Creek, the dam is regulated by the Iowa Department of Natural Resources and is inspected regularly to ensure its safety and compliance with state regulations.
Despite its low hazard potential, Dory Dam poses a moderate risk due to its location and design characteristics. The dam lacks an engineered spillway and has not been modified since its construction. While its condition is currently not rated, the dam is monitored closely for any potential risks or issues that may arise. With a surface area of 3.7 acres and a drainage area of 0.39 square miles, Dory Dam plays a crucial role in water resource management and environmental conservation efforts in Union County, Iowa.
Water resource and climate enthusiasts are drawn to Dory Dam not only for its structural design and engineering aspects but also for its importance in supporting local ecosystems and providing essential services to the community. As a regulated and inspected facility, Dory Dam exemplifies the intersection of human development and environmental stewardship, highlighting the need for sustainable management practices in ensuring the longevity and safety of water infrastructure in the region.
Year Completed |
1985 |
Dam Length |
460 |
Dam Height |
22 |
River Or Stream |
TR- TWELVEMILE CR. |
Primary Dam Type |
Earth |
Surface Area |
3.7 |
Drainage Area |
0.39 |
Nid Storage |
82 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Raccoon River At Redfield
|
268cfs |
Raccoon River At Van Meter
|
1640cfs |
East Fork 102 River At Bedford
|
1cfs |
Raccoon River Near West Des Moines
|
1300cfs |
Thompson River At Davis City
|
22cfs |
Middle Raccoon River At Panora
|
92cfs |
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.
Dory Dam