SH 121 / SH 289 Collin County and I-35E Interchange

Client: Texas Department of Transportation
Location: Dallas, TX
Start Date: May 2003
End Date: July 2007
Contract Amount: $87.3 million

Increasing population and development in the area surrounding SH 121 resulted in highway congestion, along with poor mobility, safety and air quality. Under two separate contracts, Balfour Beatty Infrastructure, Inc. worked on two significant projects along State Highway 121 in Texas. The first project, SH 121/SH 289 in Collin County, called for the reconstruction of more than five miles of existing highway, and the replacement of an existing at-grade interchange with a three-level interchange.

Increasing volumes of traffic and the old-style design of the highway entrance and exit ramps were creating a dangerous situation for motorists on one of the busiest roads in the Columbus area. The state combined two projects to ensure coordination between all phases of the project activity.

The second of these two projects involved the addition of 3.3 miles of main lanes from SH 121 to Denton Creek to east of I-35E, along with the construction of retaining walls. The project also includes reconstructing the interchange at I-35E and SH 121.

SH 121 was identified as one of the most critical projects in the Dallas area for providing access to emerging suburban areas.

 

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