Based on the latest information available, the boat ramp named Rivercrest Circle 18 is located in Benton, Arkansas, at latitude 34.58734894 and longitude -92.60481262. It is a concrete boat ramp that is open to the public and is maintained by the Arkansas Game and Fish Commission.

According to the Arkansas Game and Fish Commission website, the Rivercrest Circle 18 boat ramp provides access to the Saline River. The ramp is 30 feet wide, making it suitable for launching small to medium-sized boats. The Saline River is a popular destination for fishing, canoeing, and kayaking.

The website also notes that motorized boats are allowed on the Saline River, but there are restrictions in some areas. For example, there is a horsepower limit of 10 horsepower on certain sections of the river. Additionally, certain areas may be designated as no-wake zones, so boaters should be aware of any signage or regulations in the area.

In summary, the Rivercrest Circle 18 boat ramp in Benton, Arkansas, is a 30-foot-wide concrete ramp that provides public access to the Saline River. Motorized boats are allowed on the river, but there may be horsepower restrictions and no-wake zones in some areas.