Union Creek Watershed Dt Dam #12 Reservoir Report
Last Updated: December 13, 2025
Union Creek Watershed Dt Dam #12, located in Union, South Dakota, is a vital structure managed by the local government and designed by USDA NRCS.
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Summary
This earth dam stands 37 feet tall and spans 650 feet, completed in 1976 with a storage capacity of 59 acre-feet. It serves as a crucial component in managing the flow of the Tributary West Union Creek, with a low hazard potential and a state-regulated status. Despite not being rated for its current condition, the dam is subject to state inspections and enforcement to ensure its operational integrity.
With a maximum discharge capacity of 378 cubic feet per second, Union Creek Watershed Dt Dam #12 plays a key role in flood control and water resource management in the region. The dam's strategic location in the NWNE coordinates of 28-93-49 underscores its significance in safeguarding the surrounding area from potential inundation risks. As part of the St. Paul District, the dam's design and construction by the Natural Resources Conservation Service reflect a commitment to sustainable infrastructure development that aligns with climate resilience goals.
As water resource and climate enthusiasts, understanding the importance of Union Creek Watershed Dt Dam #12 in the broader context of watershed management is crucial. This dam not only contributes to maintaining water quality and quantity but also exemplifies the collaborative efforts between local and federal agencies to protect communities from potential hazards. By staying informed about the dam's characteristics, purpose, and regulatory oversight, enthusiasts can advocate for sustainable practices that ensure the long-term viability of water resources in Union, South Dakota.
Year Completed |
1976 |
Dam Length |
650 |
Dam Height |
37 |
River Or Stream |
TRIB. W. UNION CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
37 |
Drainage Area |
1 |
Nid Storage |
59 |
Hazard Potential |
Low |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Sioux River At Akron
|
816cfs |
Vermillion River Nr Vermillion Sd
|
33cfs |
Perry Creek Near Milnerville
|
25cfs |
Floyd River At James
|
187cfs |
Missouri River At Sioux City
|
15100cfs |
Rock River Near Rock Valley
|
321cfs |
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.
Union Creek Watershed Dt Dam #12