Mount Baker Ridge Tunnel, Interstate 90, passing under Mount Baker Rid...
Significance: In the context of Western tunneling, it is remarkable for both the material it was driven through (clay), and the form it took (twin bore). It ranks as the world's largest diameter soft earth tun... More
Mount Baker Ridge Tunnel, Interstate 90, passing under Mount Baker Rid...
Significance: In the context of Western tunneling, it is remarkable for both the material it was driven through (clay), and the form it took (twin bore). It ranks as the world's largest diameter soft earth tun... More
Mount Baker Ridge Tunnel, Interstate 90, passing under Mount Baker Rid...
Significance: In the context of Western tunneling, it is remarkable for both the material it was driven through (clay), and the form it took (twin bore). It ranks as the world's largest diameter soft earth tun... More
Mount Baker Ridge Tunnel, Interstate 90, passing under Mount Baker Rid...
Significance: In the context of Western tunneling, it is remarkable for both the material it was driven through (clay), and the form it took (twin bore). It ranks as the world's largest diameter soft earth tun... More
Mount Baker Ridge Tunnel, Interstate 90, passing under Mount Baker Rid...
Significance: In the context of Western tunneling, it is remarkable for both the material it was driven through (clay), and the form it took (twin bore). It ranks as the world's largest diameter soft earth tun... More