Roadways & Bridges
I-405 – SR 520 Bellevue Braids
Known as the Bellevue Braids because of the serpentine manner in which the ramps link I-405 to SR 520, this project improved traffic conditions at the highest-volume interchange on the I-405 corridor.
San Diego State University Tunnel & Station
Constructed under the active San Diego State University campus, this award-winning transit project included tunnels, a 50,000 square-foot trolley station, and a 14-ton arched suspension bridge for pedestrians.
Dam & Hydro
Mud Mountain Inlet
Fifty years after completing the original Mud Mountain Dam, Atkinson returned to the site to make major modifications to the flow control facilities.
Highland Boy Drainage Gallery
Atkinson completed the excavation and construction of a 15-foot-by-8,000-linear-foot horseshoe tunnel at the Bingham Canyon Mine. During excavation, crews used drill and blast techniques to advance the tunnel simultaneously from two headings in a horseshoe orientation and met in the middle.
Washington Metropolitan Area Transit Authority Rosslyn Station
Virginia’s Rosslyn Metro Station required excavation of 93-foot shaft, a 40-foot diameter mezzanine tunnel, and a 15-foot diameter passageway tunnel. The ground support system consisted of number nine by 25-foot-long post-tensioned rock anchors and steel fiber-reinforced shotcrete.
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