According to the latest information available, the Four Mile River boat ramp in Connecticut is a concrete boat ramp that is approximately 10 feet wide. It provides access to the Four Mile River, which flows into Long Island Sound. The body of water is suitable for small to medium-sized boats, kayaks, and canoes. There are no restrictions on the type of craft that are permitted on the water. The location of the boat ramp can be accessed by taking Four Mile River Road in Old Lyme, Connecticut. Get driving directions.