Monroe CO Roadgrade Site 5.4.0 is a water resource infrastructure located in Monroe, Iowa, specifically in Eddyville. This site is regulated by the Iowa Department of Natural Resources and has undergone state permitting, inspection, and enforcement. The dam at this location is primarily used for purposes other than flood control, with a low hazard potential and a moderate risk assessment rating.

Constructed in 1984, the earth dam at Monroe CO Roadgrade Site 5.4.0 stands at a height of 26 feet and has a length of 845 feet, providing storage for up to 66 acre-feet of water. Although the dam is uncontrolled, it has a spillway width of 0 feet. The site covers a surface area of 4.4 acres and drains an area of 0.33 square miles, with a maximum discharge of 0 cubic feet per second. The condition assessment of the dam is currently rated as "Not Rated", indicating a need for further evaluation.