Nada Tunnel in Red River Gorge, Kentucky. The tunnel was originally built by the Dana Lumber Company between 1910 and 1911 to transport timber via rail. The Big Woods, Red River & Lombard Railroad hauled logs from the abundant forests of the Red River valley to a sawmill in the town of Clay. The tunnel is 900 feet long, and is located on route 77, in Powell County. It was added to the National Register of Historic Places in 1992.