Interstate 35 (I-35) is one of the major transcontinental highways in the United States and serves as a crucial transportation axis in Texas. The section connecting San Antonio and Austin is the central axis of the Central Texas Corridor, playing a significant role economically, culturally, and logistically.

Overview of I-35 History

  • Initial Introduction (Late 1950s)
    I-35 was planned under the Federal-Aid Highway Act enacted during President Eisenhower's administration in 1956. It was part of a national infrastructure project aimed at streamlining the rapidly increasing automobile usage and intercity logistics.

  • Construction of the San Antonio to Austin Section (1960s)

    • In San Antonio, the I-35 section was fully opened in 1962, becoming the first completed urban section in Texas.

    • The downtown section in Austin was completed in 1962 by constructing an elevated road over the existing road known as East Avenue.

    • The entire section connecting the two cities was mostly completed by the mid-1960s, accelerating economic and population growth in the Central Texas region.

  • Issues and Traffic Congestion

    • Due to rapid expansion of urban and suburban areas, this section began to be recognized as one of the most congested roads in the United States starting in the 1990s.

    • In particular, the downtown section in Austin has been repeatedly designated as 'the most congested highway segment in the United States.'

Modernization and Expansion Projects

  • San Antonio NEX Project (Northeast Expansion)

    • Construction began in 2022, with a completion target of 2027-2028.

    • Key details: new elevated road, addition of express lanes, congestion relief.

  • Austin Capital Express Project

    • Scheduled to begin construction in 2024, with a completion target of 2033.

    • Key details: major redesign of the downtown section, installation of underground tunnels in some areas, addition of managed lanes.

Current Role of I-35

  • Formation of an economic belt connecting San Antonio, New Braunfels, San Marcos, and Austin.

  • Connecting clusters of advanced industries such as IT, biotechnology, and manufacturing.

  • A key route for North American logistics handling U.S.-Mexico trade.

In conclusion, I-35 has served as a vital artery for the economic and cultural development of Texas beyond just being a road, and large-scale modernization projects are currently underway to expand its role.

Recommended sites to view historical photos of I-35

Texas Highway Man – San Antonio Section

This site provides detailed descriptions along with early construction photos of I-35 in the San Antonio area. You can see the road construction from the 1950s to 1960s and the changes in the downtown area.

TexasFreeway.com – Austin Section

This site collects photos before and after the construction of I-35 in the Austin area, particularly valuable materials documenting the transformation of East Avenue into a highway.

Austin Chronicle – Photos of Austin Highway Construction

The Austin Chronicle features photos from the I-35 construction sites from the 1950s to 1970s, vividly showcasing the city's appearance and the changes in the road.