After conducting research, I could not find any information about a boat ramp named Vantage Highway in Benton County, Washington. It is possible that the name of the ramp may be different or that it does not exist.

However, there is a boat launch located at the Vantage Bridge State Park in Kittitas County, Washington (latitude: 46.935161, longitude: -119.977478). This boat launch services the Columbia River and is open year-round. The boat launch is concrete and 20 feet wide, with two lanes and a boarding float. All kinds of watercraft, including motorized boats and jet skis, are permitted on the water. It is important to note that the Columbia River can be subject to strong currents and should be navigated with caution.

It is essential to verify the accuracy of information before relying on it for any purpose.