Spring Branch Road Widening

Montgomery County, Texas

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Costello provided services to widen a 3.98-mile section of Spring Branch Road from Old Dobbin-Plantersville Road to the Precinct 1 Boundary at Landrum Creek. Engineering services include limited topographical survey, roadway design, drainage design (regraded ditch sections, culvert design/replacement, SW3P), striping and signing, traffic control plans, SWP3 plans, and detour plans for the widening of Spring Branch Road from an 18’-20’ wide roadway with no shoulders to a 22’ wide roadway with 1’-2’ shoulders on each side.

This project was designed in a very tight area using a prescriptive right-of-way (fence line to fence line). Ditches needed to maintain a maximum slope of 3:1 in steep drainage areas. The project was designed to construct in four phases by closing off sections of Spring Branch Road between residential intersections. The existing 8” pavement was pulverized, reworked with a new base, and spread out to the roadway width. Culverts needing repair were replaced with new pipes. Residential driveways were reconstructed and improved along the roadway. Striping and signage were updated to increase visibility and safety, especially at the horizontal curves near Landrum Creek.

Relevant Project Services

  • Roadway Design (Widening and resurfacing)
  • Drainage Design (Culvert replacement and ditch regrading)
  • Striping and Signing
  • Traffic Control Plan Design
  • Driveway Reconstruction
  • Topographic Survey

Project Size and Cost

  • 3.98 miles
  • Estimated cost $3.02M

Unique Project Attributes

  • Design roadway widening inside tight right-of-way
  • Design new drainage ditches within existing tight right-of-way

Challenges Faced

  • Designing a roadway widening using varying prescriptive right-of-way widths
  • Designing new drainage culverts to fit within the tight roadway widths and maintain acceptable side slopes.
  • Detours involved several miles of outer roadway network for traffic rerouting.

Resolutions & Results

  • Extensive coordination with Montgomery County to ensure ditches and culverts were designed correctly.
  • Safety and visibility of the roadway was significantly improved.


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