Unfortunately, there is an error in the question. Riley's Lock Road boat ramp is not located in Virginia, but in Maryland. The correct latitude and longitude coordinates are 39.070858, -77.34135437.

Riley's Lock Road boat ramp is located on the Potomac River and services this body of water. It is a concrete boat ramp with two lanes and a width of approximately 20 feet. The ramp is suitable for launching small to medium-sized boats such as kayaks, canoes, and powerboats. The ramp is also equipped with a courtesy dock and a parking lot for vehicles and trailers.

The latest information available on the official website of the Montgomery County Department of Parks confirms this information. Riley's Lock Road boat ramp remains open year-round, subject to seasonal river conditions, and is free of charge. Users are advised to check the river levels before launching their boats and to follow all safety guidelines and regulations.