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The Dalles Dam (US 2010)

In the third quarter of 2010, the US Army Corp of Engineers and their contractor, Dix Corporation hired Lampson International to replace the Downstream Navigation Lock gates at The Dalles Dam on the Columbia River in the Pacific Northwest.

The scope of the project included assembling and load testing one of our Lampson Transi-Lift® LTL-1100 mobile cranes, removing two old gate sections and laying them down for demolition, offloading two new gate sections from a floating barge and finally, installing the new pre-fabricated gate sections.

In order to have the proper equipment for the project, Lampson International mobilized a Manitowoc 4100W, a Manitowoc 3900, and a Grove 760E Rough Terrain Hydraulic Crane. In addition, the Lampson Transi-Lift® LTL-1100 was assembled on site with 200' of main boom and 2400 kips of counterweight. The two new gate sections slated for replacement weighed approximately 870,000 pounds.

During the preparation for the new gate installation, weight estimates grew from 725,000 to 949,000 pounds. While the new numbers were within the Transi-Lift's® capacities, Lampson was required to reconfigure the Transi-Lift®. This was completed in one ten hour shift to gain 200,000 pounds of capacity.

The project lasted six and a half months and although it presented a very confined work space and many other unique challenges, Lampson's use of their proprietary Transi-Lift®, coupled with exemplary planning by the Dix Corporation team, the river was opened on schedule for commercial navigation.