Weis Dam, located in Woodbury County, Iowa, is a privately owned earth dam with a primary purpose of providing fire protection and serving as a stock or small fish pond. Built in 1976 by the USDA NRCS, this dam stands at a height of 45 feet and has a length of 440 feet, with a storage capacity of 63 acre-feet. Situated on the TR-FLOYD river, Weis Dam is regulated by the Iowa Department of Natural Resources and is subject to state permitting, inspection, and enforcement.

With a low hazard potential and a moderate risk assessment rating, Weis Dam poses minimal danger to the surrounding area. While its condition is currently not rated, the dam meets state guidelines for emergency action plans and has not required modifications since its construction. As a vital water resource in Sioux City, Weis Dam plays a crucial role in mitigating flood risks, providing water storage, and supporting local wildlife habitats. This dam serves as a key infrastructure for water management and conservation efforts in the region, showcasing the importance of sustainable practices in safeguarding our natural resources for future generations.