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Sandy River Conduit Relocation

Due to damage caused by sediment as well as security concerns, the City is relocating water conveyance conduits below ground. Kiewit Pacific Co., a subsidiary of Kiewit Corporation, is constructing the Sandy River Conduit Relocation project. This design-build project involves taking the two existing above ground conduits and placing them in a 441-linear-foot tunnel under the Sandy River.

East Side CSO - Phase 2

Completing the longest micro-tunnel drive in North American history, a Kiewit-led joint venture is constructing Phase 2 of the $368 million Portland Combined Sewer Overflow project. Work includes excavation and lining of a 22-foot-diameter tunnel constructed 85 to 165 feet below ground and seven separate shafts located along the alignment.

Harlem River Tunnel

The $85.2 million Harlem River Tunnel project includes two 165-foot-deep circular shafts connected by a 675-foot-long horseshoe tunnel. Bedrock in this part of Manhattan is white marble and found at a depth of about 70 feet below grade.

Devil’s Slide Tunnel

Due to the long history of rockslides and land slippage, Kiewit Pacific Co. is constructing twin tunnels to bypass the Devil’s Slide portion of Route 1, so motorists can avoid these major slide areas. Using the New Austrian Tunneling Method, which relies on inherent rock strength for support, crews will construct the tunnels through granitic, sandstone and shale formations. The tunnels will be about 4,100 feet long, 30 feet wide, 22 feet high and 60 feet apart.

East Side CSO - Phase 1

When completed in 2011, this massive tunnel construction program will virtually eliminate combined sewer overflows into the Willamette River. A Kiewit-led joint venture completed preconstruction services under Phase I of the project. Currently, Kiewit is performing work on Phase 2, the largest component of Portland's CSO program, a $381 million network of shallow pipelines.

Chattahoochee Tunnel

As the largest project ever awarded by the Georgia Water & Sewer Authority of Cobb County, the $114 million Chattahoochee Tunnel, located just northwest of Atlanta, will supplement the current sewage system. The scope of work includes excavating a 49,600-ft.-long tunnel 100- to 350-ft deep, excavating two construction shafts and a pump station, and constructing four intake structures.