East Willow Creek J-1, also known as Severson, is a privately owned earth dam located in Preston, Minnesota. Built in 1957 by the USDA NRCS, this structure serves the primary purpose of flood risk reduction along Willow Creek-TR. With a dam height of 28 feet and a length of 310 feet, it provides a storage capacity of 20 acre-feet and a maximum discharge of 90 cubic feet per second.

Managed by the Minnesota Department of Natural Resources, the dam is state regulated, permitted, inspected, and enforced to ensure its safety and functionality. The condition assessment in 2017 rated it as fair with a low hazard potential. The risk assessment indicates a moderate risk level, prompting the need for ongoing risk management measures.

East Willow Creek J-1 plays a crucial role in protecting the surrounding area from flooding while also providing valuable insights into water resource management and climate resilience efforts in the region. Its history, design, and current condition offer a glimpse into the intricate balance of safeguarding communities against natural disasters while maintaining the integrity of water resources for future generations.