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A group of men work with equipment in a tunnel in the Cascade Mountains,Washington, ca. 1966
1. A group of men work with equipment in a tunnel in the Cascade Mountains,Washington, ca. 1966
Looking down main pressure tunnel from tunnel entrance, November 3, 1924
2. Looking down main pressure tunnel from tunnel entrance, November 3, 1924
Forms for the creation of the main tunnel, in the center of the tunnel system, May 7, 1925
3. Forms for the creation of the main tunnel, in the center of the tunnel system, May 7, 1925
Workers on inspection jumbo in tunnel, showing steel tunnel forms, bulkhead, and concrete gun discharge
4. Workers on inspection jumbo in tunnel, showing steel tunnel forms, bulkhead, and concrete gun discharge pipe, Gorge Dam, November 25, 1923
Worker standing beside steel lining of penstock at junction with main tunnel, Gorge Dam, February 9,
5. Worker standing beside steel lining of penstock at junction with main tunnel, Gorge Dam, February 9, 1924
Interior of tunnel, showing timbering of a fault in the tunnel roof, Gorge Dam, December 25, 1923
6. Interior of tunnel, showing timbering of a fault in the tunnel roof, Gorge Dam, December 25, 1923
Inspection platform in tunnel, Gorge Dam, December 25, 1923
7. Inspection platform in tunnel, Gorge Dam, December 25, 1923
Visitors at junction of tunnel interior, Gorge Dam Powerhouse, August 15, 1924
8. Visitors at junction of tunnel interior, Gorge Dam Powerhouse, August 15, 1924
Bridge across the Skagit River at the site of the Gorge Dam Powerhouse, July 17, 1921
9. Bridge across the Skagit River at the site of the Gorge Dam Powerhouse, July 17, 1921
Great Northern train leaving the Cascade Tunnel, n.d.
10. Great Northern train leaving the Cascade Tunnel, n.d.
Great Northern Railway at the east Portal of the Cascade Tunnel, Berne, n.d.
11. Great Northern Railway at the east Portal of the Cascade Tunnel, Berne, n.d.
Camp of Northern Pacific Railroad engineers during the construction of the Stampede Tunnel, in the Cascade
12. Camp of Northern Pacific Railroad engineers during the construction of the Stampede Tunnel, in the Cascade Mountains, Washington, 1886
Horse team hauling truck into floating bridge tunnel, June 1940
13. Horse team hauling truck into floating bridge tunnel, June 1940
Oriental Limited train of Great Northern Railroad, Cascade Mountains, ca. 1910
14. Oriental Limited train of Great Northern Railroad, Cascade Mountains, ca. 1910
Workers and car loaded with concrete in tunnel, ca. 1928-1930
15. Workers and car loaded with concrete in tunnel, ca. 1928-1930
Tacoma Narrows Bridge model in the University of Washington wind tunnel, ca. 1942
16. Tacoma Narrows Bridge model in the University of Washington wind tunnel, ca. 1942
Men working at entrance to concrete tunnel at Masonry Dam, April 22, 1913
17. Men working at entrance to concrete tunnel at Masonry Dam, April 22, 1913
Men at entrance to concrete tunnel at Masonry Dam, April 7, 1913
18. Men at entrance to concrete tunnel at Masonry Dam, April 7, 1913
Man standing in completed penstock tunnel between dam and powerhouse, October 22, 1925
19. Man standing in completed penstock tunnel between dam and powerhouse, October 22, 1925
Powerhouse site just after construction started with diversion tunnel entrance on lower right, July 24,
20. Powerhouse site just after construction started with diversion tunnel entrance on lower right, July 24, 1924
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