Eilen Wpa Reservoir Report
Nearby: Florida Twp 9 Webber Pond
Last Updated: December 13, 2025
Eilen Wpa, located in Deuel, South Dakota, is a federal-owned Earth dam constructed in 1989 by Ducks Unlimited, with a primary purpose related to water resource management.
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Summary
This dam on Monighan Creek stands at 9 feet tall and has a storage capacity of 725 acre-feet, with a normal storage level of 257 acre-feet serving a drainage area of 22 square miles. Despite its uncontrolled spillway, the dam has a low hazard potential and a moderate risk assessment rating.
While Eilen Wpa has not been recently inspected or assessed for its condition, it is considered to be in a not rated condition. The dam's emergency action plan status and risk management measures are also unspecified. With its location in an area represented by Dusty Johnson (R) and under the jurisdiction of the Omaha District of the US Army Corps of Engineers, Eilen Wpa serves as a notable structure for water resource and climate enthusiasts to monitor and study in the context of South Dakota's water infrastructure and environmental management.
Year Completed |
1989 |
Dam Length |
266 |
Dam Height |
9 |
River Or Stream |
MONIGHAN CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
9 |
Drainage Area |
22 |
Nid Storage |
725 |
Hazard Potential |
Low |
Nid Height |
9 |
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.
Eilen Wpa