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For nearly 80 years, tens of thousands of tons of sediment, ranging from fine sand particles to 20-in.-dia boulders, have passed through the 1,900-ft long tunnel, gradually eroding its 1-in.-thick steel floor liner.
Migrating salmon on the Deschutes River received a boost from the hatchery upgrade, which combined fish-ladder extensions and expanded holding and juvenile-rearing ponds.
The four-month effort to replace the 1920s-era landmark swinging bridge required some innovative construction approaches because the constrained, environmentally sensitive site did not lend itself to conventional ground-based construction techniques or equipment.
The 125,000-sq-ft renovation and seismic upgrade of the Providence St. Vincent Main Tower was done over four years and allowed the nine-story acute care hospital tower to remain occupied throughout the work.
The need to work within a sprawling, disjointed collection of properties helped Northwest Housing Alternatives fully appreciate how to create a community atmosphere at its Milwaukie, Ore., campus.
The $186-million King County Children and Family Justice Center modernized youth and family court services by creating a 137,000-sq-ft courthouse with 10 courtrooms, a 92,000-sq-ft, 112-bed juvenile detention center, a 10,200-sq-ft youth program space and more than 1.5 acres of open areas, including pedestrian and cycling pathways and a public plaza.
Working around the clock, the project team needed just five days to repair a damaged section of an outside support beam on the busy, 80-year-old cantilever and truss bridge.
Burns & McDonnell used an engineering-procure-construct (EPC) delivery model to help schedule phases for minimal outage times during the McNary Substation upgrade to the brownfield substation and the installation of new transmission lines.