Canadian construction company Graham has won a $455.3m design-build project for State Route (SR) 520 Montlake to Lake Washington I/C and bridge replacement, located in Seattle, Washington, US.
The Montlake Phase is one of several projects that have been taken up to replace windstorm and earthquake-vulnerable structures, while improving mobility for people and commerce across Lake Washington and through the SR 520 corridor from Seattle to Redmond.
The project involves the replacement of Evergreen Point West Approach, Union Bay Bridge, and some portions of Evergreen Point West Approach Connection, with a new West Approach Bridge South (WABS) structure.
This will provide a final connection with the south half of the new floating bridge.
Graham will construct the WABS structure to accommodate an additional east-bound high occupancy vehicle (HOV) lane.
The existing Montlake Blvd (SR 513) undercrossing will be replaced with a new community enhancement lid structure, including modifications to interchanges and connecting local overpasses.
Two new direct access ramps will be constructed as part of the project.
In addition, a new pedestrian overcrossing will connect the Washington Park Arboretum trails (south-side) to the E Montlake Park trails (north-side); path and trail connections will be improved at various locations, including partial completion of a new shared-use tunnel under Montlake Blvd E; and six bridges as well as retaining walls will be demolished.
The SR 520 project has been designed to augment programme sustainability goals through protecting and enhancing green and open spaces and aquatic habitats; lessen construction impacts; address life-cycle costs by reducing maintenance and operations through design and utilising durable materials.
Construction will begin in March 2019 and be completed in 2023.
Earlier in September 2018, Graham secured a C$76.96m contract for QuadReal’s Parkview Towers, located in Burnaby, British Columbia, close to public transit and the province’s largest shopping centre.
The 31-storey concrete building will accommodate 238 one, one plus den, and two-bedroom rental units and six rental townhomes.
It will also offer amenities, including a fitness centre, meeting room, a lounge with fire place, games room, two TV lounges, kitchen and dining area, conference room and two covered balconies. These homes will share the property with QuadReal’s two rental high-rise structures.
Early works and demolition/excavation have already begun and the substantial completion is scheduled for December 2020.
Image: A rendering of SR 520. Photo: Courtesy of Graham.