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Hoosac Tunnel, rail tunnel, 1875, 4.75 miles (7.64 km) long, Pan Am Railways (formerly Boston and Maine Railroad), through the Berkshire Mountains between North Adams and Florida, Massachusetts. The longest active transportation tunnel in North America east of the Rocky Mountains
Longest tunnel of the Central Yunnan Water Diversion Project [93] Railway Twin Tube Mont d'Ambin Base Tunnel: Cottian Alps, France/Italy 57,500 m (35.729 mi) 2032 [94] Part of the Lyon–Turin high-speed railway. Reconnaissance tunnels under construction since 2002; construction of main tunnel started in 2016. [95] Railway Twin Tube Brenner ...
The tunnel carries Interstate 70 (I-70) under the Continental Divide in the Rocky Mountains. With a maximum elevation of 11,158 feet (3,401 m) above sea level, it is one of the highest vehicular tunnels in the world. The tunnel is the longest mountain tunnel and highest point on the Interstate Highway System.
Baiyunshan Tunnel China 6.458 km (4.013 mi) 2026 2 Yuxiang 2nd Expressway Wufu Tunnel China 6.454 km (4.010 mi) 2026 2 G50 12 Enshi-Guangyuan Expressway Baolongping Tunnel China (Chongqing, Sichuan) 6.450 km (4.008 mi) 2025 2 Chongqing-Chishui-Xuyong Expressway Jiangyin-Jingjiang Yangtse River Tunnel
Daxing'anling Tunnel China (Inner Mongolia) 14.970 km (9.302 mi) 2027 Harbin-Manzhouli Railway: Qunke Tunnel China 14.955 km (9.3 mi) 2028 Chengdu–Lanzhou Railway: Duomuge Tunnel China 14.884 km (9.248 mi) 2030 Sichuan-Tibet railway: Tiefengshan Tunnel China 14.783 km (9.186 mi) 2028 Chongqing-Xi'an HSR: Hengshan Tunnel
At a length of 13,300 ft (4,100 m), or 2.51 miles, it is the longest highway tunnel and longest combined rail and highway tunnel in North America. The tunnel originated as a rail-only tunnel excavated in 1941–42. The tunnel was upgraded to bimodal use by the Kiewit Construction Company between September 1998 and mid-summer 2000. [13] [14]
Scientific American, July 1927 - America's Longest Tunnel. University of Washington Libraries Digital Collections – Lee Pickett Photographs Over 1400 photographs documenting scenes from Snohomish, King and Chelan Counties in Washington State from the early 1900s to the 1940s. Includes images of the Cascade Tunnel construction.
Poola Subbaiah Veligonda Project Tunnel - II [70] [65] Andhra Pradesh, India: 18.83 km (11.7 mi) 2021 [needs update] Irrigation Poola Subbaiah Veligonda Project Tunnel - I [70] [65] Andhra Pradesh, India: 18.82 km (11.7 mi) 2020 [needs update] [71] Irrigation Many more tunnels that are shorter than 15 kilometres (9 mi) are under construction