According to the latest information available, Pierce Riffle is a public boat ramp located in Josephine County, Oregon. It is situated at latitude 42.42306519 and longitude -123.24263. The ramp is concrete and has a width of approximately 12 feet.

Pierce Riffle boat ramp services the Rogue River, a popular destination for fishing, kayaking, and rafting. The river is known for its scenic beauty and abundant wildlife. The ramp is located near the town of Merlin and is easily accessible from Interstate 5.

A variety of watercraft are permitted on the Rogue River, including powerboats, kayaks, canoes, and rafts. However, there are regulations in place to protect the river's natural resources and ensure the safety of all users. Boaters are advised to check with local authorities for the latest information on regulations and permits.

In summary, Pierce Riffle boat ramp is a public concrete ramp located in Josephine County, Oregon. It services the Rogue River and is approximately 12 feet wide. A variety of watercraft are permitted on the river, subject to regulations and permits.