Sioux Poinsett Gpa Reservoir Report

Last Updated: December 13, 2025

Sioux Poinsett Gpa is a state-regulated earth dam located in Hamlin, South Dakota, along the tributary of the Big Sioux River.


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Summary

Completed in 1995, this dam stands at a height of 11 feet and has a storage capacity of 125 acre-feet. The primary purpose of this dam is to provide flood control and regulate the flow of water in the area, with a spillway width of 100 feet to manage excess water during heavy rainfall events.

With a low hazard potential and a moderate risk assessment rating, Sioux Poinsett Gpa plays a crucial role in mitigating the impact of potential flooding in the region. Despite not having a current condition assessment rating, the dam is regularly inspected, permitted, and enforced by the South Dakota Department of Environment and Natural Resources (DENR). The dam's design and construction adhere to state regulations, ensuring its structural integrity and functionality in managing water resources and climate-related risks in the area.

As water resource and climate enthusiasts, it is essential to recognize the importance of infrastructure like Sioux Poinsett Gpa in safeguarding communities and ecosystems from the impacts of extreme weather events. By staying informed about the regulatory oversight, maintenance, and risk management measures associated with dams like Sioux Poinsett Gpa, we can better understand how these structures contribute to sustainable water management practices and resilience in the face of a changing climate.

Year Completed

1995

Dam Length

400

Dam Height

11

River Or Stream

TRIB. BIG SIOUX RIVER

Primary Dam Type

Earth

Hydraulic Height

11

Drainage Area

5

Nid Storage

125

Outlet Gates

None

Hazard Potential

Low

Nid Height

11
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.