Specifications
Total Cost: $7,683,915 (1950)
Total Length: 3,791 Ft.
Distance between Portals: 2,936 Ft.
Length of Tube Section: 1,500 Ft.
Roadway Width: 22 Ft.
Headroom (each lane): 13 Ft.
Headroom (center Lane): 18 Ft.
Internal Diameter of Tubes: 32 Ft.
External Diameter of Tubes: 38 Ft.
Max. Grade: 6%
Max. Dept (Water to top): 45 Ft.
Max. Dept (Water to roadway): 68 Ft.
Max. Dept (water to bottom): 80 Ft.
Dredging: 425,273 cu. yards
Excavation: 289,600 cu. yards
Tremie Concrete: 11,750 cu. yards
Concrete: 34,250 cu. yards
Steel in tubes: 2,373 tons
Ceramic Tile: 1,061,000
Number of fans: 3
Max Ventilation: 760,000 cfm
Complete Air Exchange: 2 minutes
Read more about this topic: Washburn Tunnel