Sylvan Avenue Bridge Replacement
Overview

The previous Trinity River crossing consisted of three separate bridges. Two of them crossed the east and west levees, and one low-water crossing bridge over the Trinity River. With the Trinity River crossing sitting at such a low elevation in the Trinity River floodplain, it became impassable at times of high water, accentuating the need for a new, more hydraulically efficient crossing. The new bridge raises the profile of Sylvan Avenue out of the floodplain. In fact, the crossing is built above the 800-year flood elevation providing uninterrupted traffic flow year round.

The new Sylvan Avenue Bridge is a 23-span bridge that incorporates context sensitive features such as ornamental lighting, open railings, and a ramp which allows both vehicular and pedestrian access to Trammell Crow Park and its soccer fields below. It is composed of precast concrete I-girders and spliced post-tensioned girder for the longer spans over the river crossing. There are 3 post-tensioned units, each consisting of 3 spans. Summit Engineering (Summit) provided construction engineering to the contractor and developed shop drawings for the precaster for the spliced, post-tensioned units. This type of construction was relatively new to TxDOT and the City of Dallas.  Summit introduced a number of innovative concepts to enhance the constructability of the project. To reduce construction costs, Summit developed an integral corbel system to support the girders during construction of the post-tensioned units. This eliminated the need for external strongbacks at 132 total splice locations and enabled all of the bridge girders to be erected in a single phase of construction.

Bridge Geometry
Length of Main Span 200 & 250 Feet
Total Project Length 3,500 Feet
Lanes on Existing Structure Six lanes and two sidewalks

The new bridge preserves and enhances scenic, aesthetic, community, and environmental resources, while improving the safety and mobility of the travelling public.

- Gregg A. Reese, PE, President, Summit Engineering Group