LP 1604 Feasibility Study, TxDOT, San Antonio District
Bexar County, TX

IEA Inc. was the Prime Consultant responsible for a 50-mile feasibility study for Loop 1604 from IH 10 to US 90.

The study analyzed the expansion of the existing 2-lane facility to an interim 4-lane divided facility and ultimately a freeway due to the growth in the San Antonio area. The scope included aerial mapping, identification of environmental constraints and preliminary utility conflicts, conceptual schematics, and an engineering summary report.

Alternatives Evaluation:

The safety of this route was degrading due to rapid growth in the early stage of urbanization. Loop 1604 was a 2-lane undivided facility. IEA identified an ultimate schematic footprint and an interim configuration within the existing ROW to the extent possible. IEA's schematic used the existing infrastructure to the extent possible to address the increasing traffic volumes and declining roadway safety. IEA evaluated 9 interchanges for interim and ultimate phases, including stack flip and fully directional interchange options. The evaluation included a review of FEMA impacts, the location of drainage outfalls, and needed culvert sizes.

Constraints Mapping:

The constraints identification process found potential impacts on land use, environmental justice populations, right-of-way, karst and Edwards Aquifer, oil wells, historic buildings, and utilities.