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San Antonio Area Freeway System
PROJECT INFO: Loop 1604 from Culebra to Potranco

This page last updated April 23, 2019


Project locationLocation
Loop 1604 from Culebra Rd. to Potranco Rd.

Under construction (85% complete). Southbound mainlanes have opened to traffic.

This project will upgrade Loop 1604 at this location from a four-lane divided highway to a four-lane, toll-free expressway. This includes adding
overpasses at Wiseman Blvd., Military Dr. West, and Potranco Rd. (FM 1957), continuous access roads, and entrance and exit ramps. The discovery of a sensitive karst feature along the western edge of the right-of-way between Wiseman and Military will necessitate a short bow in the corridor. Otherwise, the expansion will be completed by converting the existing northbound lanes to the northbound access road, converting the existing southbound lanes to northbound expressway lanes, and constructing the remaining lanes (southbound expressway and access road.) Unbeknownst to most motorists, the existing divided highway was originally designed to eventually be expanded to an expressway as described above; this will reduce costs, expedite the work a bit and minimize disruption to traffic.

The cost of this project is $62.5 million and is being paid for with local funds from the Advanced Transportation District as part of the larger $825 five-year regional transportation plan announced in January 2014.

How this project will help
Staggering ongoing growth in this area of San Antonio necessitates upgrading this roadway. The new expressway lanes with overpasses at the currently signalized intersections will allow for continuous free-flowing traffic through the corridor.
The four expressway lanes are anticipated to handle the projected traffic in this corridor for the next 20 years.

The official groundbreaking occurred on September 12, 2016. Construction began in October 2016 and estimated completion is mid 2019.
Click here for the latest status report on this project.

The southbound mainlanes opened on April 18, 2019.


  • Why are the new sections of Loop 1604 only four lanes? It needs to be six lanes or more.
    The number of lanes for a new roadway is based on current and projected traffic volumes for the next 20 years. Twenty years is the accepted planning horizon for a couple of reasons. First, that's the length of time before a road will need major repairs and upgrades simply due to age (i.e. the road's expected lifespan.) Second, that length of time is the longest that any projections can be considered even remotely reasonable. Since nobody has a crystal ball, traffic projections are "educated guesses" based on the best data available for future development in an area and past growth. Roads are then planned based on those projections. In the case of the new segments of Loop 1604, those projections show that four lanes will be adequate for the 20 years. TxDOT, as a steward of taxpayer dollars, cannot spend more than they can justify, a policy I'm sure most taxpayers support, especially with all the other needs that need to be funded.

Click on the image below to open the detailed schematic for this project from TxDOT with my own annotations added to help clarify and explain the various elements. The schematic will open in a new window that you can scroll and zoom.

(Note: the schematic is somewhat large and may take a few seconds to open.)


Other sites of interest
TxDOT - Loop 1604 from FM 1957 to FM 471

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