Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: The Chicago Skyway Toll Bridge system crosses the Calumet River on a 650'-0"-long cantilever Warren through truss. This is Chicago's highest and longest bridge, and perhaps more importantly, its More
Significance: This 400' half-viaduct was an engineer's solution to aligning the Historic Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line More
Significance: This 400' half-viaduct was an engineer's solution to aligning the Historic Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line More
Significance: This 400' half-viaduct was an engineer's solution to aligning the Historic Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line More
Significance: This 860' half-viaduct was an engineer's solution to aligning the Historic Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line More
Significance: This 860' half-viaduct was an engineer's solution to aligning the Historic Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line More
Significance: This 860' half-viaduct was an engineer's solution to aligning the Historic Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line More
Significance: This 860' half-viaduct was an engineer's solution to aligning the Historic Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line More
Significance: This 860' half-viaduct was an engineer's solution to aligning the Historic Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line More
Significance: This 860' half-viaduct was an engineer's solution to aligning the Historic Columbia River Highway between a steep unstable slope and the Oregon Washington Railroad and Navigation Company main line More
Significance: The present Golden Gate Viaduct occupies the location of several historic viaducts. The original structure at Golden Gate was built in 1885 by the U.S. Army Corps of Engineers, which was responsi More
Significance: The present Golden Gate Viaduct occupies the location of several historic viaducts. The original structure at Golden Gate was built in 1885 by the U.S. Army Corps of Engineers, which was responsi More
Significance: The present Golden Gate Viaduct occupies the location of several historic viaducts. The original structure at Golden Gate was built in 1885 by the U.S. Army Corps of Engineers, which was responsi More
Significance: The present Golden Gate Viaduct occupies the location of several historic viaducts. The original structure at Golden Gate was built in 1885 by the U.S. Army Corps of Engineers, which was responsi More
Significance: The present Golden Gate Viaduct occupies the location of several historic viaducts. The original structure at Golden Gate was built in 1885 by the U.S. Army Corps of Engineers, which was responsi More
Significance: The present Golden Gate Viaduct occupies the location of several historic viaducts. The original structure at Golden Gate was built in 1885 by the U.S. Army Corps of Engineers, which was responsi More
Significance: The present Golden Gate Viaduct occupies the location of several historic viaducts. The original structure at Golden Gate was built in 1885 by the U.S. Army Corps of Engineers, which was responsi More