The De Vries Dam in Pella, Iowa, also known as the Fountain Hills Plats 3 and 4 Dam, is a private earth dam designed by Garden and Associates for fire protection, stock, or small fish pond purposes. Completed in 2012, this dam has a height of 25 feet and a length of 375 feet, providing a storage capacity of 33 acre-feet with a normal storage of 22 acre-feet. Situated on TR-Thunder Creek in Marion County, Iowa, the dam serves as a low hazard potential structure with a spillway width of 16 feet.

Managed by the Iowa Department of Natural Resources, the De Vries Dam is regulated, inspected, and enforced by the state, ensuring its safety and compliance with regulations. With a surface area of 3 acres and draining a 0.04 square mile drainage area, the dam has a maximum discharge capacity of 10 cubic feet per second. Despite its "Not Rated" condition assessment, the dam continues to provide essential services and protection to the surrounding area, under the oversight of the state regulatory agency.

As a significant water resource in the region, the De Vries Dam plays a crucial role in providing fire protection and supporting local wildlife through its stock and small fish pond functions. With its strategic location and design, the dam stands as a testament to effective water management and conservation efforts in the state of Iowa.