Environmental Study

SH 45SW Design Refinements

During final design of SH 45SW, the Mobility Authority identified design changes that would benefit the project through reduced environmental impacts, improved operations, and/or increased safety. These design refinements were submitted in June 2015 to the Texas Department of Transportation’s Environmental Affairs Division (ENV); it was determined that an environmental reevaluation is required. A reevaluation is an assessment of any refinements made to either the project's design or the affected environment, and a determination of what effects these refinements might have on the validity of the environmental documentation.

In response, the design team will submit the required reevaluation documentation. ENV will then determine if the refinements under reevaluation can move forward. Ultimately, all design refinements are recommended to more efficiently meet environmental commitments and reduce the overall footprint of the project. Learn more about SH 45SW design refinements.

Environmental Study for the SH 45SW Project

TxDOT conducted an environmental study of an area between MoPac and FM 1626. The study began in June 2013.

During the study, an Environmental Impact Statement (EIS) document was prepared to fully evaluate and disclose the potential impacts of the project.

Resources studied as part of the EIS include:

  • Land Use
  • Vegetation
  • Socioeconomic Resources
  • Threatened and Endangered Species
  • Geology and Soils
  • Archeological Resources
  • Air Quality
  • Historic Resources
  • Noise Environment
  • Hazardous Materials
  • Groundwater Resources
  • Visual and Aesthetic Qualities
  • Surface Water Resources
  • Indirect and Cumulative Impacts

Final Environmental Impact Statment

The Final Environmental Impact Statement was completed in January 2015. View the Final Environmental Impact Statement (230MB).

On March 5, 2015, the Texas Department of Transportation issued a Record of Decision (ROD) which allowed the SH 45SW project to proceed to final design and construction, with specific commitments to protect the environment during its construction and operation.

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