SH 288 T-Ramp

Brazoria County, Texas

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Prime Engineer for the PS&E preparation of an elevated T-Ramp allowing direct, local access to the SH 288 toll lanes centered between existing SH 288 at Discovery Bay/Hughes Ranch Road. The project involved the complex geometric and structural design of the elevated intersection, multi-agency and segment designer coordination, and collaboration with separate illumination and utility design firms.

The T-Ramp provided a two-lane, two-way operation connecting the traveling public east and west of SH 288 with the Brazoria County toll road. Tolling operations prohibited traffic from crossing SH 288 from east to west. Costello met this requirement by designing traffic control features that forced eastbound traffic to turn left and westbound traffic to turn right at the elevated intersection without blocking southbound turning movements.

The construction project included local street reconstruction, retaining walls, storm sewer conveyance, four signalized intersections, signing, and pavement marking.

Relevant Project Services

  • Structural design
  • Geometric design
  • Traffic control
  • Multi-agency coordination

Project Size and Cost

  • Estimated Cost $5.5M

Unique Project Attributes

  • Cast-in-place concrete span integral with substructure designed to replace costly steel girders

Challenges Faced

  • Critical substructure overhangs the roadway
  • Poor soil conditions

Resolutions & Results

  • Added protective carbon fiber wrap
  • Over-excavation for retaining walls


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