After conducting research, I was unable to find any specific information about a boat ramp named Old Barren River Road 4142 in Warren County, Kentucky with the provided latitude and longitude coordinates. It is possible that the information provided is outdated or inaccurate.

However, Warren County does have several boat ramps that provide access to the Barren River Lake, including the Barren River Lake State Resort Park Boat Ramp and the Tailwater Recreation Area Boat Ramp. These ramps are suitable for a range of watercraft, including boats, kayaks, and canoes.

The Barren River Lake is a popular destination for fishing, boating, and other water-related activities, and is known for its scenic beauty and abundant wildlife. It covers over 10,000 acres and has over 100 miles of shoreline, offering plenty of opportunities for exploration and adventure.

In terms of width, boat ramps can vary in size depending on the location and specific needs of the area. However, most ramps are designed to accommodate a wide range of watercraft, from small boats to larger vessels. It is important to always check local regulations and guidelines to ensure that your watercraft is permitted on the water and that you are following all safety guidelines.