Iowa Noname49 is a dam located in Sioux County, Iowa, on the TR-BIG SIOUX RIVER. Built in 1966 by the USDA NRCS, this earth dam stands at a height of 61 feet and spans 520 feet in length. With a storage capacity of 206 acre-feet, it serves multiple purposes including recreation and other activities.

Owned and regulated by the local government, specifically the IOWA DNR, Iowa Noname49 is classified as a low hazard potential structure with a moderate risk assessment rating of 3. Despite not having a condition assessment rating, the dam is regularly inspected, permitted, and enforced by state agencies to ensure its safety and functionality. With a surface area of 10 acres and draining an area of 0.65 square miles, this dam plays a crucial role in managing water resources in the region.

As a key feature in the St. Paul District of the USACE, Iowa Noname49 showcases the collaborative efforts between federal and state agencies in water resource management. While the dam lacks certain features like outlet gates and locks, its uncontrolled spillway type and soil foundation contribute to its overall structural integrity. With its location in HAWARDEN, Iowa, this dam serves as a significant infrastructure for the community, offering recreational opportunities and contributing to the overall water management efforts in the region.