Search for all of "Tunnels", all of "Diversion Tunnels"

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	Title	Description
101	Hoover Dam construction	"Upstream toward lower portals." [hand-written inscription on back of photo] This view shows the Colorado River in Black Canyon during the early stages of the construction of Hoover Dam. A suspension bridge across the river can be...
102	Hoover Dam construction -- various phases	This postcard shows the construction of Hoover Dam in four different stages. All views were taken from the same point looking upstream. The first image shows Black Canyon and the Colorado River at the very beginning of construction...
103	Construction of Hoover Dam	"First load of muck used in coffer dam [sic]. Looking at Arizona portals #3 & #4. Water now flowing thru these." (hand-written inscription on back of photo) Shows a dump truck dumping the muck and construction...
104	Diversion tunnel -- Hoover Dam	Shows a man standing inside a diversion tunnel at the Hoover Dam site.
105	Construction -- Hoover Dam	Handwritten inscription on back of photo: "Rex motor mixer that has been picked off a white truck and being swung into position at tunnel #1 with load of cement." Shows hoisting machinery, railroad tracks, a steam locomotive, a...
106	Hoover Dam construction	Panoramic view of the Hoover Dam construction site. One of the lower portals to a division tunnel can be seen. Buildings, trucks, and the cofferdam are also visible. A portion of the Colorado River is...
107	Hoover Dam construction	Shows one of the portals to the diversion tunnels. A portion of the Colorado River is visible as well as construction workers and construction buildings.
108	Hoover Dam construction	Handwritten inscription on back of photo: "Looking upstream into Black Canyon toward Boulder damsite after river had been diverted thru diversion tunnels Nos. 3 and 4. Temporary back-wash dike seen immediately upstream from tunnel out..." Portals to...
109	Aerial view of Hoover Dam and surrounding area	Aerial view of the completed dam showing the downstream face and powerhouses. Lake Mead (reservoir) can be seen as it fills behind the dam. Water is spilling from the outlet works and one of the lower portals to...
110	Aerial view of Hoover Dam and surrounding area	Aerial view of Hoover Dam showing the upstream face, the power houses, one of the portals to a diversion tunnel, and the intake towers. Lake Mead (the reservoir) is filling and a portion of the Colorado River is also...
111	Hoover Dam construction	Panoramic view of Black Canyon and Hoover Dam under construction. Two of the portals to the diversion tunnels are visible. The face of the dam is nearing completion and the concrete pouring forms can be seen. Part...
112	Aerial view -- Hoover Dam construction	Aerial view of Hoover Dam, Black Canyon, and the Colordo River during the construction of the dam. Two portals of the diversion tunnels are visible. There are trucks and buildings on the cofferdam. The face of the...
113	View showing method of finishing slabs in invert lining.	Construction workers are operating machinery to finish slabs in the invert lining of a diversion tunnel at the Hoover Dam site.
114	Hoover Dam -- retouched photo	Panoramic view of Hoover Dam and area including Fortifiction Hill in background. The photo was taken looking towards the downstream face and shows the power houses, some of the portals to the diversion tunnels, the Colorado River, and Lake...
115	Hoover Dam -- retouched photo	View of Hoover Dam and surrounding area with Fortification Hill in the background. This is a postcard with the following printed on the front: "This is an actual photo of the retouched photograph from which engraving for the...
116	Trucks hauling concrete in the diversion tunnel	This photo shows trucks and equipment used for hauling and pouring concrete to form the invert lining in a diversion tunnel at Hoover Dam. Also shows some construction workers.
117	Aerial view of Hoover Dam	Aerial view of the completed Hoover Dam and the surrounding area showing the Colorado River below the dam and Lake Mead (the reservoir) above the dam. Water is flowing from the outlet works, and some of the portals to...
118	Interior of diversion tunnel during Hoover Dam construction	Interior view of a diversion tunnel, showing the water conduit being placed. Scaffolding is visible and the area is lit with electric lighting.
119	Diversion of the Colorado River into diversion tunnel no. 1 as the gate on diversion...	View of the diversion of the Colorado River into diversion tunnel no. 1 as the gate on diversion tunnel no. 4 is being lowered (on the left). A line of construction workers can be seen standing on the bank of...
120	Construction on Hoover Dam and the power houses looking upstream from the lower portals road	View of the Hoover Dam construction site in Black Canyon, showing the nearly-completed dam face and construction on the power houses in the lower cofferdam. Concrete pouring forms are seen on the tops of the power houses. Temporary buildings...
121	Hoover Dam construction site, looking upstream from the lower portals road	View of the Hoover Dam construction site in Black Canyon, showing the nearly-completed dam face and construction on the power houses in the lower cofferdam. Concrete pouring forms are seen on the tops of the power houses. Temporary buildings,...
122	Construction on Hoover Dam and the power houses looking upstream from the lower portals road	View of the Hoover Dam construction site in Black Canyon, showing the nearly-completed dam face and construction on the power houses in the lower cofferdam. Concrete pouring forms are seen on the tops of the power houses. Temporary buildings, construction...
123	Aerial view of Hoover Dam, looking upstream on the Colorado River	Aerial view of the Hoover Dam construction site in Black Canyon. Visible are the spillways, intake towers, dam face, diversion tunnels and construction on the power houses. Temporary buildings are seen in the cofferdam downstream of the dam face. The...
124	Hoover Dam -- downstream face	Color transparency looking towards the downstream face of Hoover Dam. Part of the Colorado River and the portals to the diversion tunnels ares visible.
125	View of Hoover Dam from the downstream side of the Colorado River	View of Hoover Dam from downstream on the Colorado River. Water is being discharged from the outlet works of the Nevada valve house on the left. Part of the Nevada power house and the central power house are seen at...
126	Hoover Dam -- upstream side	Shows upstream side of the dam with the almost-finished intake towers. Also shows the mouth of a diversion tunnel and derrick cranes on both sides of the canyon. The reservoir (Lake Mead) has begun to fill.
127	Hoover Dam -- upstream side	Shows upstream face of dam with almost-completed intake towers. The reservoir (Lake Mead) has started to fill, and a man is rowing a boat on the lake. The mouth of a diversion tunnel on the left side of the picture...
128	Aerial view of Hoover Dam	Aerial view of Hoover Dam with the outlet works on boths ides of the dam spewing water. Above the dam the reservoir (Lake Mead) is beginning to fill. Fortification Hill is in the background. the central power house...
129	Hoover Dam -- outlet works	Shows the downstream face of the dam with the outlet works spewing water. The entrances to two of the diversion tunnels are visible. There is a dump truck parked on one of the side roads.
130	Outlet works -- Hoover Dam	Upstream view of Hoover Dam, showing the Arizona outlet works spewing water. The power houses and part of the entrance to one diversion tunnel are visible.
131	Water discharging from the Nevada and Arizona outlet works into the Colorado River	View of water discharging from the Nevada and Arizona outlet works in the valve houses into the Colorado River downstream from Hoover Dam in Black Canyon. Diversion tunnel portals and a steel bridge are seen in the foreground. Two of...
132	View of water discharging from the Nevada and Arizona outlet works into the Colorado River	View of Hoover Dam from downstream on the Colorado River. Water is being discharged from the Nevada and Arizona outlet works in the valve houses. The diversion tunnel portals and a steel bridge are seen in the foreground. Cables are...