SNOFLO
 


PONCA

RESERVOIR LEVELS
Willow Creek
May 12, 2025


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Ponca, also known as Indian Lake, is a Federal-owned irrigation reservoir located in Milks Camp, Gregory, South Dakota. Managed by the Bureau of Indian Affairs, this earth dam structure was completed in 1935 and serves multiple purposes including irrigation, fire protection, and stock or small fish pond. The dam has a structural height of 45 feet and a length of 580 feet, with a storage capacity of 1190 acre-feet.

Despite being a vital water resource for the area, Ponca poses a high hazard potential due to its condition assessment not being available. The last inspection date was in 2012, with an inspection frequency of 5 years. The reservoir is situated on Willow Creek and falls under the jurisdiction of the St. Paul District of the US Army Corps of Engineers. Ponca is crucial for irrigation in the region but requires proper risk management measures to ensure the safety of the surrounding community.

With Dusty Johnson (R) as the Congressional Representative for the area, Ponca faces a very high risk assessment rating of 1. Emergency action plans and inundation maps are not readily available, highlighting the need for improved preparedness and risk mitigation strategies. As water resource and climate enthusiasts, it is essential to monitor and advocate for the maintenance and safety of structures like Ponca to ensure sustainable water management practices and environmental protection in the region.

Year_Completed 1935
River_Or_Stream WILLOW CREEK
Dam_Length 580
Primary_Dam_Type Earth
Nid_Storage 1190
Structural_Height 45
Hazard_Potential High
Nid_Height 45
       

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