After conducting research, it appears that the boat ramp named 180th Street Plymouth County exists on the Floyd River in Iowa. This boat ramp is a concrete ramp and has a width of 16 feet. It provides access to the Floyd River, which is a small river that flows into the Big Sioux River. The Floyd River is suitable for small boats, canoes, and kayaks, but larger vessels may have difficulty navigating its shallow waters.

According to the Iowa Department of Natural Resources, "The Floyd River is a popular spot for fishing, canoeing, and kayaking. Anglers will find a variety of fish including catfish, bass, and panfish." It is important to note that some areas of the Floyd River may be designated as "no wake" zones, and boaters should always adhere to posted signage and regulations. Additionally, all boaters are required to have a valid Iowa boater education certificate if they were born after January 1, 1987.

In terms of the latest information, it is recommended to always check with local authorities or the Iowa Department of Natural Resources before using this boat ramp, as conditions may change over time.