According to the latest information available, the 120th Street boat ramp in Louisa County, Iowa is a concrete boat ramp. It is approximately 22 feet wide, providing ample space for boats to launch and retrieve. The ramp provides access to the Mississippi River, which is a major waterbody in Iowa and serves as an important transportation route and recreational area.

The boat ramp is designed for various types of watercraft, including boats, pontoons, kayaks, and canoes. However, it is important to note that the Mississippi River can have strong currents and varying water levels, so boaters should exercise caution and ensure their craft is suitable for the conditions.

Overall, the 120th Street boat ramp in Louisa County, Iowa is a well-maintained facility that provides easy access to the Mississippi River for a variety of watercraft.