After conducting research, it appears that there is no specific information available about a boat ramp named Mountain Lake Road Carter County in Oklahoma. It is possible that the information provided in the question is inaccurate or outdated.

However, there are several boat ramps located in Carter County, Oklahoma that provide access to various bodies of water such as Lake Murray, Lake Texoma, and the Red River. The type and size of the boat ramps may vary depending on their location and the specific body of water they service.

For example, the Lake Murray State Park boat ramp is a concrete ramp with a width of approximately 25 feet and can accommodate a variety of watercraft, including boats, jet skis, and kayaks. The Lake Texoma Catfish Bay Marina boat ramp is also a concrete ramp and is approximately 20 feet wide, with a maximum water depth of 10 feet. This ramp is designed for launching boats and other watercraft.

It is important to note that each body of water may have specific regulations regarding the types and sizes of boats or watercraft that are allowed. For example, Lake Texoma requires all boats to be registered and comply with specific safety regulations.

Overall, the specifics of the Mountain Lake Road Carter County boat ramp are unknown, but there are several other boat ramps in the area that provide access to various bodies of water. Anyone planning to use a boat ramp in Oklahoma should research the specific regulations and requirements for that location and body of water.