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Penstock tunnels under construction at the Gorge Dam Powerhouse site, April 1922
1. Penstock tunnels under construction at the Gorge Dam Powerhouse site, April 1922
Tunnel entrance, probably the west portal of the tunnel constructed to carry water from the Gorge Dam
2. Tunnel entrance, probably the west portal of the tunnel constructed to carry water from the Gorge Dam reservoir to the powerhouse, August 12, 1920
Diversion dam and tunnel under construction, Diablo Dam, April 12, 1928
3. Diversion dam and tunnel under construction, Diablo Dam, April 12, 1928
Diversion dam and tunnel construction, Diablo Dam, March 1928
4. Diversion dam and tunnel construction, Diablo Dam, March 1928
Workers with a concrete pump, also known as a concrete gun, showing 5 yard concrete car and gas locomotive
5. Workers with a concrete pump, also known as a concrete gun, showing 5 yard concrete car and gas locomotive in tunnel, Gorge Dam, November 4, 1923
Interior of concrete-lined tunnel constructed to carry water from the Gorge Dam reservoir to the Powerhouse,
6. Interior of concrete-lined tunnel constructed to carry water from the Gorge Dam reservoir to the Powerhouse, September 21, 1923
Workers on inspection jumbo in tunnel, showing steel tunnel forms, bulkhead, and concrete gun discharge
7. 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,
8. 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
9. 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
10. Inspection platform in tunnel, Gorge Dam, December 25, 1923
Workers with mechanical mucking shovel at work in tunnel, Gorge Dam, November 4, 1923
11. Workers with mechanical mucking shovel at work in tunnel, Gorge Dam, November 4, 1923
Visitors at junction of tunnel interior, Gorge Dam Powerhouse, August 15, 1924
12. Visitors at junction of tunnel interior, Gorge Dam Powerhouse, August 15, 1924
Woman standing in mouth of penstock tunnel, Gorge Dam Powerhouse, April 1, 1924
13. Woman standing in mouth of penstock tunnel, Gorge Dam Powerhouse, April 1, 1924
Bench drilling crew in tunnel, Gorge Dam, November 7, 1923
14. Bench drilling crew in tunnel, Gorge Dam, November 7, 1923
West portal of tunnel constructed to carry water from Gorge Dam reservoir to Powerhouse, February 1922
15. West portal of tunnel constructed to carry water from Gorge Dam reservoir to Powerhouse, February 1922
 
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