Dejong Dam, located in Marion County, Iowa, is a private earth dam designed by the USDA NRCS and completed in 1963. The dam serves multiple purposes, including fire protection and creating a stock or small fish pond, with a storage capacity of 470 acre-feet and a surface area of 27.3 acres. Situated on TR-ENGLISH CREEK, the dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure compliance with state standards.

With a height of 44 feet and a length of 538 feet, Dejong Dam has a low hazard potential and is considered to have a moderate risk level. Despite being uncontrolled, the spillway type of the dam ensures proper water management during high flow events. The dam's condition assessment is currently not rated, but it meets safety guidelines, and emergency preparedness measures are in place. Overall, Dejong Dam stands as a vital infrastructure for water resource management and climate resilience in the region, reflecting a commitment to protecting both human and environmental interests.