Looming over the town of Nicholson, Pennsylvania is the Tunkhannock Creek Viaduct, a railroad bridge completed in 1915. It is a concrete deck arch bridge on the Nicholson Cutoff rail segment of the Norfolk Southern Railway Sunbury Line that spans Tunkhannock Creek. Measuring 2,375 feet (724 m) long and 240 feet (73.15 m) tall when measured from the creek bed (300 feet (91.44 m) from bedrock), it was the largest concrete structure in the world when completed in 1915 and still merited “the title of largest concrete bridge in America, if not the world” 50 years later. Built by the Delaware, Lackawanna and Western Railroad, the bridge is owned today by Norfolk Southern Railway and is still used daily for regular through freight service. Apparently almost half of the bulk of this behemoth is underground, in the form of bridge pillars up to 138 feet (142 m) below ground.
The bridge was listed on the National Register of Historic Places on April 11, 1977. In 1975, the American Society of Civil Engineers or ASCE designated the bridge as a Historic Civil Engineering Landmark. ASCE recognized the bridge as “not only a great feat of construction skill” but also a “bold and successful departure from contemporary, conventional concepts of railroad location in that it carried a mainline transversely to the regional drainage pattern, effectively reducing the distance and grade impediments…”
I also swung by Lackawanna State Park on my way back from the bridge. The 1,445-acre park is ten miles north of Scranton. The focus is the 198-acre Lackawanna Lake, which is surrounded by picnic areas and multi-use trails winding through forest. Boating, camping, fishing, mountain biking, and swimming are popular recreation activities here.