Based on the latest information available, the Sunnyside Mabton Road boat ramp in Mabton, Washington is a concrete boat ramp that is 20 feet wide. It provides access to the Yakima River, which is a popular fishing and recreational waterway in the region. The boat ramp is suitable for small boats, canoes, kayaks, and other non-motorized watercraft. However, it is important to note that the regulations and restrictions on the watercraft allowed on the Yakima River may change depending on the season and local guidelines. Therefore, it is recommended to check with local authorities or the Washington Department of Fish and Wildlife for the latest information on permitted watercraft and regulations before using the Sunnyside Mabton Road boat ramp.