Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Mears Memorial Bridge is a truss bridge on the Alaska Railroad, completed in 1923. The bridge spans the Tanana River at Nenana and is among the largest simple truss-type bridges in the world. The bridge s namesake, Frederick Mears, was chairman and chief engineer of the Alaskan Engineering Commission, the railroad s builder and original operator. The bridge was the final link in the railroad, entering service in February 1923, a year after the rest of the 470 miles line was finished.