May 17, 2019

Otak was an essential part of the team that won this year’s National ACEC Engineering Excellence National Grand Award for design of the Linking Lookout: US 6 and 19th Street Interchange Project. Otak provided bridge and retaining wall design for this seamless connection between the residential, west side of the US 6 and the Colorado School of Mines and Downtown Golden. What was previously an at-grade intersection, which was dangerous to navigate on foot or by bike, became a safe, grade-separated crossing with US 6 dropped 25 feet below 19th Street.

The bridge crossing consists of a 40-foot-wide vehicular section and a 240-foot-wide, landscaped “lid” with multi-use-path connections, a single-track trail, and seating areas.  The lid required special waterproofing techniques to ensure structural integrity of the concrete girders that were covered by grass and plant material, with engineered fill up to 10 feet deep in places. Otak was also responsible for the design of approximately 70,000 square feet of soil-nail retaining wall, as well as urban design elements consisting of masonry pilasters and a decorative steel arch.

Dan Beltzer was Otak’s project manager and bridge engineer and Pete Loris was responsible for the retaining wall design. Otak (previously Loris and Associates) was a subconsultant to IMEG (previously TST).   

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