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This is a view of
the coffer tunnel at Terzaghi Dam, through which the Bridge River
was diverted while the dam was under construction; the concrete
structure in the upper part of the picture is the rarely-used
spillway, which lets out excess water during the spring freshet. For
a sense of scale, the tunnel is about 5 metres (17 ft.) in diameter.
Note the shatter-pattern in the rocks above the tunnel and adjacent to
the spillway, indicative of the blasting that was used to secure the
foundations of the dam in its canyon setting. The mountain wall this
tunnel is at the foot of is a few thousand feet high, as is that
immediately behind the lens. The following two pictures were (I
think) taken by Art Roozeboom, a professional photographer from North
Vancouver hired by the company to document construction. They
show construction crews at work on the dam before its completion |
