According to the latest information available, the McCormack Campground boat ramp in Oregon is a concrete boat ramp that is approximately 16 feet wide. This boat ramp services the Brownlee Reservoir, which is a large body of water located on the Snake River. The Brownlee Reservoir is popular for recreational boating, fishing, and water sports.

As for the types of craft that are permitted on the water, the reservoir allows for a variety of watercraft including motorized boats, sailboats, canoes, and kayaks. However, it is important to note that there may be specific regulations regarding motorized boats, such as speed limits or permits required for certain activities. It is always best to check with local authorities or park officials for up-to-date information and regulations.