L.A.’s New Sixth Road Viaduct Undertaking Named Yr’s Most Excellent Engineering Triumph


On Tuesday, the brand new Sixth Road Viaduct Undertaking in Los Angeles received the 2023 “Grand Conceptor” Award signifying the 12 months’s most excellent engineering achievement. 

The venture was honored on the 57th Annual Engineering Excellence Awards Gala (EEA)—a nationwide juried competitors awards ceremony sponsored by the American Council of Engineering Corporations (ACEC).

Hosted by famous comic Ross Shafer, Tuesday evening’s EEA Gala honored 179 excellent engineering achievements from the U.S. and worldwide.

Designed by HNTB of Los Angeles, the Sixth Road Viaduct is a 3,500-foot tied arch bridge domestically referred to as the “Ribbon of Mild.” The construction re-establishes a vital thoroughfare between L.A.’s historic Boyle Heights on the east aspect with the Downtown Arts District on the west. 

Paying homage to the unique double-arched 1932-era predecessor closed for demolition in 2016, the brand new viaduct options ten pairs of sculptural 30-and 60-foot concrete arches. Every arch is supported by an modern seismic isolation system designed to face up to a 1,000-year seismic occasion. It is also the biggest bridge venture within the historical past of Los Angeles.

The venture may even embody a brand new 12-acre public park working beneath the bridge, accessible by a number of stairways and a monumental helical bike ramp at the moment beneath building.

The venture joins a prestigious checklist of current Grand Conceptor Award winners, together with the Moynihan Practice Corridor (New York, NY, 2022), Copperhill Watershed Restoration (Ducktown, Tennessee, 2020); and the SR 520 Floating Bridge Alternative (Seattle, 2017). 

Different 2023 Engineering Excellence Award Winners are:


  • Frederick Douglass Memorial Bridge Undertaking, Washington, DC, AECOM
  • I-74 Hall over the Mississippi River, Bettendorf and Davenport, IA and Moline and Rock Island, IL,  Benesch & Modjeski and Masters
  • Hugh Okay. Leatherman Terminal, North Charleston, SC, HDR
  • Clear Creek Canyon Park, Gateway Section; Golden, CO; Muller Engineering
  • PAE Residing Constructing, Portland, OR, PAE
  • Delta’s New Terminal C at LaGuardia Airport, Queens, NY, STV/Satterfield & Pontikes (Joint Enterprise)
  • Local weather Pledge Enviornment, Seattle, WA, Thornton Tomasetti


  • NASA Langley Measurement Methods Laboratory, Hampton, VA, AECOM
  • Jane Byrne Interchange, Chicago, IL, AECOM & TranSystems (Joint Enterprise)
  • Metropolis Stroll BHAM, Birmingham, AL, Barge Design Options
  • Towerside District Stormwater Administration System, Minneapolis, MN, Barr Engineering
  • I-295 over Veranda Road Bridge Alternative, Portland, ME, HNTB
  • Reconstruction and Rehabilitation on the Verrazzano-Narrows Bridge, Brooklyn to Staten Island, NY, HNTB, WSP USA (Joint Enterprise)
  • Metropolis of Billings Nutrient Enhancements, Billings, MT, HDR
  • I-579 City Open Area Cap, Pittsburgh, PA, HDR
  • SEA Worldwide Arrivals Facility, Seattle, WA, KPFF
  • Chatham Park Water Restoration Heart, Pittsboro, NCMcKim & Creed
  • 100 Vandam Road, New York, NY, Severud Associates
  • Navajo-Gallup Water Provide Undertaking, Councelor, NM, Souder, Miller & Associates
  • Bridging Kentucky, Frankfort, KY, Stantec, Qk4 and AECOM
  • Seapoint Industrial Terminal Advanced, Savannah, GA,Terracon
  • Retailers Bridge Important Span Trusses & East Method, St. Louis, MO,TranSystems
  • 66 Hudson Boulevard – The Spiral, New York, NY, WSP USA


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