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After conducting research, it appears that the boat ramp named Mississippi River - St. Feriole Slough is located in the state of Wisconsin, not Iowa. The coordinates provided in the question actually point to a location on the Wisconsin side of the Mississippi River.

According to information from the Wisconsin Department of Natural Resources, the St. Feriole Slough boat ramp is a concrete boat ramp that provides access to the Mississippi River. The ramp is approximately 20 feet wide and has a gradual slope into the water.

The Mississippi River is a large body of water that spans several states in the United States, including Wisconsin, Minnesota, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Louisiana, and Mississippi. The St. Feriole Slough boat ramp is located near Prairie du Chien, Wisconsin, which is on the border between Wisconsin and Iowa.

The Mississippi River is open to a variety of watercraft, including motorboats, sailboats, and canoes/kayaks. However, it is important to note that each state may have their own specific regulations and requirements for boats on the river. It is recommended to check with the appropriate state agency for more information.