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results 1-20 of 77 item(s)  page 1 of 4 : ( <<  1  2  3  4  >> ) :: previous : next
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Installing the penstocks in the tunnels, July 20, 1911
1. Installing the penstocks in the tunnels, July 20, 1911
Penstock tunnels under construction at the Gorge Dam Powerhouse site, April 1922
2. Penstock tunnels under construction at the Gorge Dam Powerhouse site, April 1922
Installation of gates for the three small tunnels which will contain the penstocks, May 15, 1911
3. Installation of gates for the three small tunnels which will contain the penstocks, May 15, 1911
Wooden concrete forms inside one of the tunnels which will contain the penstocks, March 1, 1911
4. Wooden concrete forms inside one of the tunnels which will contain the penstocks, March 1, 1911
Forebay showing entrance to the three tunnels which will contain penstocks, August 23, 1911
5. Forebay showing entrance to the three tunnels which will contain penstocks, August 23, 1911
Entrance to tunnels on the west side of the Lake Washington Floating Bridge, n.d.
6. Entrance to tunnels on the west side of the Lake Washington Floating Bridge, n.d.
Installation of steel Y-shaped tunnels underneath standpipes, October 15, 1924
7. Installation of steel Y-shaped tunnels underneath standpipes, October 15, 1924
Tunnels going from Lake Tapps outlet canal to powerhouse, November 1, 1910
8. Tunnels going from Lake Tapps outlet canal to powerhouse, November 1, 1910
Forms for the creation of the main tunnel, in the center of the tunnel system, May 7, 1925
9. Forms for the creation of the main tunnel, in the center of the tunnel system, May 7, 1925
Construction of forebay leading into penstock tunnels, May 30, 1911
10. Construction of forebay leading into penstock tunnels, May 30, 1911
Main tunnel, northwest of Lake Tapps, leading into forebay and penstock tunnels, July 28, 1911
11. Main tunnel, northwest of Lake Tapps, leading into forebay and penstock tunnels, July 28, 1911
Artist's rendering of construction and dimensions of tunnels for the Lake Washignton Floating Bridge,
12. Artist's rendering of construction and dimensions of tunnels for the Lake Washignton Floating Bridge, Seattle, ca. 1939
Architectural rendering of the east portal of the Lake Washington Floating Bridge tunnels, Seattle, ca.
13. Architectural rendering of the east portal of the Lake Washington Floating Bridge tunnels, Seattle, ca. 1939
A group of men work with equipment in a tunnel in the Cascade Mountains,Washington, ca. 1966
14. A group of men work with equipment in a tunnel in the Cascade Mountains,Washington, ca. 1966
Interior of tunnel, Masonry Dam, October 18, 1914
15. Interior of tunnel, Masonry Dam, October 18, 1914
Construction of the covered flume from the northwest corner of Lake Tapps to the tunnels and penstocks,
16. Construction of the covered flume from the northwest corner of Lake Tapps to the tunnels and penstocks, June 23, 1911
Tunnel entrance, probably the west portal of the tunnel constructed to carry water from the Gorge Dam
17. Tunnel entrance, probably the west portal of the tunnel constructed to carry water from the Gorge Dam reservoir to the powerhouse, August 12, 1920
Men working at entrance to concrete tunnel at Masonry Dam, April 22, 1913
18. 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
19. Men at entrance to concrete tunnel at Masonry Dam, April 7, 1913
Looking down main pressure tunnel from tunnel entrance, November 3, 1924
20. Looking down main pressure tunnel from tunnel entrance, November 3, 1924
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