Big Wyacondah Watershed Site 20 Reservoir Report
Last Updated: December 6, 2025
Located in the picturesque Big Wyacondah Watershed in Iowa, Site 20 is a vital water resource managed by the local government for various purposes including fire protection, stock, and small fish pond activities.
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Summary
Constructed in 1971 by the USDA NRCS, this Earth-type dam stands at 27 feet tall and spans 506 feet in length, providing a storage capacity of 66 acre-feet in the South Wyacondah River basin.
With a low hazard potential and a moderate risk assessment rating, Big Wyacondah Watershed Site 20 is a key component of flood risk reduction in the region. While not currently rated for condition assessment, the dam's state-regulated status ensures ongoing inspection, enforcement, and permitting by the Iowa DNR to maintain its integrity and safety. This site serves as a valuable asset in water management and conservation efforts, contributing to the overall sustainability of the watershed ecosystem in Davis County.
Water resource and climate enthusiasts will find Big Wyacondah Watershed Site 20 to be a fascinating case study in dam infrastructure and management. From its historical construction to its modern regulatory oversight, this site exemplifies the importance of responsible water resource utilization for both human activities and environmental protection. As a part of the larger network of dams in the area, Site 20 plays a crucial role in ensuring water security and resilience in the face of changing climate conditions, making it a noteworthy site for study and appreciation.
Year Completed |
1971 |
Dam Length |
506 |
Dam Height |
27 |
River Or Stream |
TR-SOUTH WYACONDAH RIVER |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.29 |
Nid Storage |
66 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Fox River At Bloomfield
|
7cfs |
Chariton River At Livonia
|
45cfs |
Des Moines River At Keosauqua
|
1800cfs |
Chariton River Near Moulton
|
34cfs |
Des Moines River At Ottumwa
|
1090cfs |
Chariton River Near Rathbun
|
14cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
McGowen Rec Area
|
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Lake Fisher
|
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Drakesville City Park
|
Big Wyacondah Watershed Site 20