Clark bridge, a bigger form (courtesy howthingswork list)

A cable-stayed bridge over the Penobscot river is being built to replace a
75 year old suspension bridge. The State of Maine DOT has a web site that
documents the project in great detail. On several occasions in the past we
have had some discussion about cable stayed bridges. If you are interested
in how a cable-stayed bridge is built this web site is a great resource
(warning can be a major time sink). Every week or two for the past three
years they have put out a news letter detailing the bridge's construction. I've
been very interest in the project because my family comes from the area and
I have had a chance on trips to an from Maine to watch the bridge being
built.

The bridge is being built using the "balanced cantilever method". Two
pylons were built to a height of about 140 feet. At that point construction
started to proceeded in three directions. The pylons continued to be built
up to their final height of about 440 feet. And the road deck started to be
built in two directions; one section heading towards the center of the river
and one section heading back towards the shore. Just before the final
segment of the bridge was poured there were two 440 ft tall towers each
balancing two 500 ft long sections of concrete roadway. A most interesting
sight to see. These three newsletters should give you a good feel for how
the bridge was built.

http://www.waldohancockbridge.com/waldo-county-bridge/updates/2005-08-19-update.pdf

http://www.waldohancockbridge.com/waldo-county-bridge/updates/2006-04-21.pdf

http://www.waldohancockbridge.com/waldo-county-bridge/updates/2006-06-16.pdf

Home page for the bridge project:

http://www.waldohancockbridge.com/waldo-county-bridge/index.php

The web site's organization is a little clumsy so navigating it can be a
challenge.