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May 21, 2021
E330 Downtown Tunnel
Location: Bellevue
General contractor: Guy F. Atkinson Construction
The downtown Bellevue tunnel runs from the south portal near 112th Avenue Southeast and Main Street to the north portal at 110th Avenue Northeast and Northeast Sixth Street adjacent to the Bellevue Transit Center. The work included 26,000 square feet of soil-nail wall support of excavation. The 1,985-linear-foot sequential-excavation method tunnel included tunnel pre-support lattice girders with shotcrete lining, groundwater control, waterproofing, final concrete lining, tunnel walkway, center dividing wall, embeds and conduits, and a mid-tunnel access shaft and exit. Construction of a 250-foot cut-and-cover structure was completed at the south portal. Work included utilities, pavement repair, sidewalks and signals.
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