HNTB’s winning concept for LA’s 6th Street Viaduct Replacement Project

HNTB winning proposal via Sixth Street Viaduct Replacement Project

In April, Mayor Villaraigosa and City Council Member Huizar announced an international design competition to redesign the historic, 80-year-old Sixth Street Bridge in . The decision to launch the competition came after engineers warned that the bridge was at risk of failing during a major earthquake due to a degenerative structural problem known as “concrete cancer”. After careful consideration and entertaining the idea of constructing a replica of the 1932 icon, the city committed to moving forward with a major redesign. In mid-October, the national infrastructure firm HNTB, along with team members and AC Martin Partners, were announced as winners of the international competition.

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ARC Wildlife Crossing Competition winner / HNTB + Michael Van Valkenburgh & Associates

© and Michael Van Valkenburgh Associates Inc.

Announced in Washington DC the ARC jury of internationally-respected professionals with expertise in design, ecology, and engineering selected entry ‘hypar-nature’ led by HNTB with as the winner of the ARC International Design Competition.

The ARC Wildlife Crossing Competition challenged interdisciplinary design teams to create the next generation of wildlife crossing structures for North America’s roadways. The four inter-related objectives for the competition included:

  • Provide an avenue for international teams of design professionals to address new design challenges in the coalescent issues of road transportation safety, structural engineering, wildlife conservation and landscape ecology;
  • Explore creative new approaches, materials, and designs that address the fundamentals of transportation engineering and ecology;
  • Increase the number of potential solutions for cost efficient, innovative crossing designs that can be adapted for widespread use in other locations; and,
  • Engage design professionals and students in the interdisciplinary nature of road ecology with a real-time, in-situ application.

HNTB + MVVA Team Members: HNTB Engineering, Michael Van Valkenburgh Associates Inc. Landscape Architects PC,  Applied Ecological Services
Competition Timeline: September 2010 – January 2011
Renderings and Drawings: HNTB and Michael Van Valkenburgh Associates Inc.