Based on the latest information available, the West Frontage Road Stillwater County boat ramp in Montana is a concrete boat ramp that is approximately 20 feet wide. It provides access to the Yellowstone River, which is a major river in the western United States that flows through Montana, North Dakota, and Wyoming.

According to the Montana Fish, Wildlife & Parks website, the Yellowstone River is open to a variety of watercraft, including motorized boats, drift boats, kayaks, and canoes. However, there may be certain restrictions or regulations in place depending on the specific section of the river and the time of year. It is recommended to check with local authorities or the Montana Fish, Wildlife & Parks website for the most up-to-date information on boating regulations in the area.