Based on the latest information available, the Smith River Marina & Campground boat ramp is located at latitude 43.77436066 and longitude -123.99635315 in Oregon. It provides access to the Smith River, which is a tributary of the Umpqua River.

The boat ramp is reportedly a single-lane ramp suitable for small to medium-sized watercraft, including fishing boats, pleasure boats, and kayaks. It is also wide enough to accommodate trailers, although the exact width is not available.

According to the Smith River Marina & Campground website, the marina welcomes all types of motorized and non-motorized boats, including jet skis and pontoons. However, it is not clear if there are any size or horsepower restrictions in place.

Overall, the Smith River Marina & Campground boat ramp appears to offer easy access to the Smith River for a variety of watercraft, making it a popular destination for boaters and anglers in the area.