Katy Trail Extension Phase VI/Pedestrian Bridge over Mockingbird Lane
Award of Merit
Owner: City of Dallas, Dept. of Public Works
Lead Design Firm/Structural: HNTB Corp.
General Contractor: Rebcon Inc.
Civil Engineer: Urban Engineers Group Inc.
Structural Engineer: JQ Engineering
MEP Engineer: Yaggi Engineering Inc.
This three-quarter-mile city trail extension enhances access to Mockingbird Station, Southern Methodist University and the George W. Bush Presidential Library.
Building a bridge over heavily traveled Mockingbird Lane using conventional methods was not feasible, so a cable-stayed, 456-ft-long pedestrian bridge was chosen for the $11.6-million project, with three towers canted over the trail centerline in response to site constraints. The construction team sequenced construction and eliminated temporary shoring towers to minimize impacts to the public.
As the micropiles for the bridge were installed, the team detected gasoline-tainted groundwater, so crews used a camera to see inside the drilling hole and followed other environmental procedures. An abandoned underground tank was discovered nearby, and within a week the issue was resolved.
The project was finished as scheduled in November 2017, although some additional time was needed for the Dallas Area Rapid Transit to ascertain that all potential impacts to its tunnels beneath the project had been eliminated.