The State Route 107 Montesano boat ramp is located in Montesano, Washington at latitude 46.96256256 and longitude -123.60350037. It is a concrete boat ramp that provides access to the Chehalis River. The ramp is 25 feet wide, which allows for easy launching and retrieval of boats.

According to the latest information available, the State Route 107 Montesano boat ramp is open to all types of watercraft, including powerboats, kayaks, canoes, and paddleboards. The Chehalis River is a popular destination for fishing and boating enthusiasts, with species such as salmon, steelhead, and sturgeon found in the water.

It should be noted that regulations and restrictions may vary depending on the time of year and the type of watercraft being used. It is important for boaters to check with local authorities and the Washington State Parks and Recreation Commission for the latest information on regulations and safety guidelines before using the State Route 107 Montesano boat ramp.