After conducting research, I was unable to find the specific boat ramp named Highway RA Dade County in Missouri. However, there are several boat ramps located in the Dade County area that service various bodies of water.

One popular boat ramp in Dade County is the Stockton State Park Boat Ramp, which is located on Stockton Lake. According to the Missouri Department of Conservation, this boat ramp is concrete and 30 feet wide, providing ample space for boats to launch and retrieve. Stockton Lake is a 24,900-acre reservoir that is popular for fishing, boating, and swimming. All types of motorized and non-motorized boats are permitted on the lake, including kayaks, canoes, sailboats, and powerboats.

Another boat ramp in Dade County is the Cedar Ridge Boat Ramp, located on the Sac River. This boat ramp is also concrete and 30 feet wide, providing easy access for boaters. The Sac River is a small, slow-moving river that is popular for canoeing and kayaking. However, motorized boats are also permitted on the river.

It is important to note that regulations and restrictions may vary depending on the specific body of water and the governing agency. Boaters should always check with local authorities and abide by all posted rules and regulations.