Projects

6th Street Demo

6th St Viaduct Replacement

Location: Los Angeles, CA
Client: Silverado Contractors
Description: Engineered demolition of half-mile long viaduct in congested urban center.
Engineering Scope: Bridge removal plans for a total of 45 concrete and steel spans over the 101 freeway, railroads, and the LA river. Design of debris containment measures to protect adjacent structures. Foothills Bridge Co also provided full time on-site support.

San Francisco Oakland Bay Bridge — 504 and 288 Span Removal

San Francisco Oakland Bay Bridge — 504 and 288 Span Removal

Location: San Francisco, CA
Client: California Engineering / Silverado JV
Description: Engineered lowering and dismantling of 19 1930s steel truss spans.
Engineering Scope: Bridge removal plans for five 504 ft spans and 14 288 ft spans, including design of truss retrofit members, span lowering structures, span dismantling plans (on barges), and substructure removal. Foothills Bridge Co also provided full time on-site support.
Watch: the animation and the timelapse of the Span E4 lowering.

Tappan Zee Bridge Replacement

Tappan Zee Bridge Replacement

Location: Tarrytown, NY
Client: Tappan Zee Constructors
Description: Engineered dismantling of 2400' cantilever truss main span.
Engineering Scope: Sequential bridge removal plan including design of temporary truss members, local member stress releases, barge-based crane removal, jacking operations and floating caisson stability.

Goethals Bridge Replacement

Location: Staten Island, NY
Client: R.E. Pierson Construction
Description: Engineered dismantling of 1150' cantilever main span and 64 steel girder approach spans
Engineering Scope: Sequential bridge removal plan, including design of suspended span lowering operation, barge-based crane removal, temporary supports, access trestle, and substructure removal

SR 520 Floating Bridge Replacement

Location: Belleview, WA
Client: Kiewit/General/Manson JV
Description: Replacement of 8500' long floating bridge
Engineering Scope: Removal plan for 300 ton transition span truss structures using marine crane, including deck removal, rigging design, and weight verification using hydraulic jacks

Port Mann Bridge Replacement

Port Mann Bridge Replacement

Location: Vancouver, British Columbia
Client: Kiewit/Flatiron General Partnership
Description: Construction of 10-lane cable stayed bridge and removal of 1960s steel arch and girder bridge.
Engineering Scope: Bridge removal plan for 30 steel girder spans ranging in length from 125’ to 225’, including removal over land and water.

San Francisco Oakland Bay Bridge — Cantilever Spans

San Francisco Oakland Bay Bridge — Cantilever Spans

Location: San Francisco, CA
Client: California Engineering / Silverado JV
Description: Engineered dismantling of 1930s cantilever and 2009 temporary bypass spans.
Engineering Scope: Sequential bridge removal plan, progressive jacking sequences, design of temporary truss members, design of marine and land-based temporary support designs.
Read more: about the process of dismantling the cantilever truss span as featured in Bridge Design and Engineering magazine. View Article

Waldo Hancock Bridge Removal

Waldo Hancock Bridge Removal

Location: Bucksport, ME
Client: S&R Corporation
Description: Dismantling of 1930s suspension bridge over the Penobscot River.
Engineering Scope: Bridge removal plans for deck, towers and cables.

Paseo del Norte/I-25 Interchange

Paseo del Norte/I-25 Interchange

Location: Albuquerque, NM
Client: Kiewit New Mexico
Description: Construction of 5-span, curved steel girder flyover bridge.
Engineering Scope: Girder assembly and erection plan, design of temporary supports.

Champlain Bridge Replacement Feasibility Study

Location: Montreal, QC
Client: Parsons, Tetra Tech, AMEC JV
Description: Feasibility study for removal of cantilever truss bridge and approach spans
Engineering Scope: Evaluate potential bridge dismantling and material disposal methods for steel truss and prestressed concrete girder spans