Sioux Falls Divers. Weir Reservoir Report
Nearby: Sioux Falls Diversion Nordstrom
Last Updated: December 13, 2025
Sioux Falls Divers.
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Summary
Weir, located in Minnehaha County, South Dakota, is a gravity dam completed in 1960 with a height of 27 feet and a length of 331 feet. It serves as a vital water resource management structure with a storage capacity of 1200 acre-feet and a maximum discharge of 35,000 cubic feet per second. The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and is subject to regular inspections, enforcement, and permitting to ensure its structural integrity and safety.
Managed by the local government, Sioux Falls Divers. Weir plays a significant role in flood control and water supply management in the region. While the dam's condition assessment is currently listed as "Not Rated," its hazard potential is deemed to be significant. The dam's emergency action plan status, risk assessment, and risk management measures are yet to be fully evaluated and updated. As a crucial infrastructure in the St. Paul District, the dam's operations are essential for protecting downstream areas and maintaining water quality in the region.
With Dusty Johnson (R) as the Congressional Representative overseeing the area, Sioux Falls Divers. Weir stands as a key component in the water resource infrastructure of South Dakota. As climate change impacts water resources, the proper maintenance and monitoring of dams like Sioux Falls Divers. Weir become increasingly important to ensure the safety and security of communities and ecosystems that depend on its operations.
Year Completed |
1960 |
Dam Length |
331 |
Dam Height |
27 |
Primary Dam Type |
Gravity |
Nid Storage |
1200 |
Hazard Potential |
Significant |
Nid Height |
27 |
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.
Sioux Falls Divers. Weir