Based on the latest information available, the boat ramp named Northeast State Highway 300 Mason County is a public boat ramp located in Mason County, Washington. It is a concrete boat ramp and is approximately 20 feet wide.

The boat ramp provides access to the waters of the Puget Sound, specifically the Case Inlet. This body of water is a large, salty inlet that is connected to the southern part of the Puget Sound by the Carr Inlet. The Case Inlet is known for its excellent fishing opportunities, particularly for salmon and bottom fish.

The boat ramp is designed to accommodate a variety of watercraft, including boats, kayaks, canoes, and other small vessels. However, there are certain restrictions in place for the type and size of boats that can be launched from the ramp. For example, boats with a length of more than 26 feet are not allowed, and jet skis and personal watercraft are also prohibited.

Overall, the Northeast State Highway 300 Mason County boat ramp is a convenient and accessible option for boaters looking to explore the Case Inlet and the surrounding waters of the Puget Sound in Mason County, Washington.