Based on the latest information available, the US 287 Gallatin County boat ramp in Montana is a concrete boat ramp that provides access to the Gallatin River. It is approximately 16 feet wide and can accommodate small to medium-sized watercraft such as canoes, kayaks, and rafts.

The Gallatin River is a popular destination for recreational activities such as fishing, rafting, and kayaking. It is also a designated Wild and Scenic River, which means that certain regulations are in place to protect its natural characteristics.

In terms of the specific craft that are permitted on the water, it may vary depending on the time of year and current water conditions. It is important for boaters to check with local authorities or the Gallatin National Forest Service for any restrictions or guidelines before entering the water.