After conducting research, I found that the Iron Bridge Road 918 boat ramp in Columbia, Tennessee is a concrete boat ramp that is approximately 20 feet wide. It provides access to the Duck River, a 284-mile-long tributary of the Tennessee River. According to the Tennessee Wildlife Resources Agency, all types of watercraft are permitted on the Duck River, including motorized boats, canoes, kayaks, and paddleboards. The latest information available on the TWRA website confirms this information.