After conducting research, I found that the boat ramp named South Pierce Avenue Mason City, Iowa is a concrete boat ramp. The width of the ramp is not specified, but it is noted to be a single-lane ramp. This boat ramp services Clear Lake, which is approximately 7,000 acres in size and is a popular destination for boaters and fishermen.

As per the Iowa Department of Natural Resources, the following watercraft are permitted on Clear Lake: motorized boats, sailboats, canoes, kayaks, and paddleboards. Additionally, the department notes that all watercraft must have proper safety equipment on board, including personal flotation devices.

It is important to note that the information available may change over time, and it is always recommended to check with local authorities or the Iowa Department of Natural Resources for the most up-to-date information.