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Union Station Tunnel Rehabilitation

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After undergoing several structural repairs, Modjeski and Masters was enlisted to provide Phase I, II, and III engineering services to reconstruct the east and center portions of the Union Station Tunnel which consist of steel members and a concrete ceiling slab supported on concrete columns.

M&M began the project collaborating with the Owner and Contractor using the CM/GC project delivery method, focusing on finding ways to reduce cost and expedite the schedule. M&M created several partial design packages allowing the Contractor to accelerate procurement of materials to meet a very tight construction schedule. The first phase of the project, including replacement of the catenary system through the tunnel limits; a new operational communications complex; and a new continuous fiber connection to Civic Center Station was completed under the CM/GC model. Design of the tunnel structure, a new dry standpipe system, and emergency egress lighting are currently being completed under a typical design/bid/build model.

As a part of the design process, M&M has focused on staging construction using accelerated construction methods to limit interruptions to the upper Union Station parking lot and the lower MetroLink light rail service. These methods have included low overhead construction which allows the substructure to be installed without removing the tunnel lid.


Bridge Geometry
Total Structure Length 1,055 feet
Tracks Serviced 2