Sources · Dispatch

Triple Underpass History: Dallas's Gateway, 1934 to Today

Dallas, Texas · Filed from the source ledger·Filed 2026-10-29

The Triple Underpass is the concrete bridge at the western edge of Dealey Plaza in downtown Dallas, where Elm, Main and Commerce streets converge and pass beneath the railroad tracks. Construction began in 1934 and the structure opened on May 1, 1936. It was built as a civic showpiece and a traffic solution. Most visitors now know it because of what happened a few yards away on November 22, 1963.

This guide covers both stories: why the underpass exists, how it was built, what it looks like, and what the official record says about its role in 1963.

Why Dallas built a triple underpass

The underpass solved a very old Dallas problem: trains and streets competing for the same ground at the city's western edge. The plan routed Main, Commerce and Elm streets beneath a railroad bridge carrying trains to Union Station. Architect Otto Lang is credited with the idea of funneling three roads into one passage.

The bigger vision belonged to planner George Kessler. According to a Dallas Morning News account, Dealey Plaza and the Triple Underpass were products of Kessler's ideas, developed after the 1908 flood. The idea was to tame the Trinity River bottoms and give the city a formal front door.

That "front door" language stuck. The area was developed as "The Front Door of Dallas" in the 1930s as a landscaped park and vehicle gateway, and the underpass was the gateway piece of it. We have not linked that phrase to a specific page here, so treat it as local shorthand rather than a citation.

Clearing the land

The site was not empty. City blocks were cleared in 1934, including buildings such as the 1890 Fire Station No. 5 and other structures from early Dallas. The project created a gateway to the western edge of downtown, and it cost the city some of its oldest buildings, a trade-off Dallas historians still debate.

Street history here is unusually well documented. Warren Commission Exhibit 2188 gathers an 1855 Dallas map, 1934 City Council resolutions, a city plat book and a City Secretary's letter. It also describes the closure of Broadway and Water streets near the underpass. The Commission collected this material because the geometry of those streets mattered to understanding the motorcade route.

Construction, 1934 to 1936

The underpass was built by Austin Bridge Company and Austin Road Company starting in 1934. It was a joint effort with the Texas Highway Department and the City of Dallas. The job was awkward: up to 80 trains a day ran over the site, so builders had to coordinate closely with the railroads.

The finished structure was unveiled in 1936, in the same period as the Texas Centennial celebrations, and Dallas was eager to show visitors a modern city. The same account notes it was hailed as a modern marvel.

The 1940 plan is documented in the Dallas Municipal Archives' New Deal collection. The 1975 and 1978 designations come from the National Park Service's landmark documentation.

What the Triple Underpass looks like

The underpass is built of concrete with square balusters and distinctive Art Deco detailing, a simplified style typical of WPA projects of the late 1930s. It is not ornate. What you notice first is mass: a low, wide railroad bridge with three openings, and a long wall of concrete parapet on either side.

How the streets run through it

The Warren Commission's own description is the clearest. Elm Street runs west and southwest toward the underpass, Main Street divides the plaza, and Commerce Street runs east and southeast from it. The same document places the underpass at the western boundary of the 3.07-acre plaza, which is named for George B. Dealey and focuses traffic between downtown Dallas and major highway systems.

In practice, standing on the plaza facing west, Elm is on your right, Main in the middle, Commerce on your left, and all three disappear beneath the same bridge. If you want a street-by-street picture of how the presidential motorcade used this geometry, our motorcade route guide walks it in order.

The Triple Underpass on November 22, 1963

The underpass entered national memory when the presidential limousine drove toward it on Elm Street. Here the record needs care, because this is the part of the story most surrounded by rumor.

The Warren Commission reported that many people believed the shots came from the railroad bridge over the Triple Underpass or the area west of the Depository. It also found no credible evidence that shots were fired from anywhere other than the Texas School Book Depository.

The Commission also counted who was on the bridge. On the day, 15 persons were identified on the railroad bridge: two policemen, two freight bureau employees and eleven Union Terminal Company employees. Those people were vantage-point witnesses, and their statements are part of the record.

Later reviews reached a consistent conclusion. The Rockefeller Commission examined the autopsy X-rays and photographs, and the House Select Committee used scientific analyses, including acoustical analysis, and concluded the shots that struck Kennedy were fired from the Texas School Book Depository. The House committee's wider conclusions drew separate debate, and we cover the competing claims in JFK conspiracy theories vs. evidence.

For a minute-by-minute reconstruction, see November 22, 1963 events rebuilt from evidence.

How the area has changed

The bridge and its surroundings are more intact than most visitors expect. Dealey Plaza was designated a local historic district in 1975 and entered the National Register three years later, which is why the landscape reads so close to its 1930s form. The structure has also been documented by the Historic American Buildings Survey, and researchers connected to Southern Methodist University and the University of Texas at Dallas have written about the site.

What has changed is how people use it. A place built to move cars quickly now draws pedestrians stopping on the curb. That tension, a working road beside a memorial landscape, drives recurring design discussions. A Dallas Morning News feature asked a team of designers to reimagine the site, and the project is a good snapshot of how much opinion Dallas holds about it.

For how the wider city shifted after 1963, read Dallas in 1963: the city before and after November 22.

Perspective: why we treat the underpass as evidence

We build our work on one rule: a place is a source, not a backdrop. The underpass is a good example. A visitor can stand on the curb and see in seconds why witnesses on the bridge mattered, why the street geometry shaped the motorcade, and why a gunshot's echo might seem to come from the wrong direction.

That is also why we separate three kinds of statements. There are measurements and maps, such as the plaza's size and the street layout. There are witness accounts, such as the 15 people on the bridge. And there are conclusions, such as the findings of the Commission and later reviews. Each deserves different weight, and mixing them is how history turns into folklore.

When you visit, bring that habit. Ask of every claim you hear on the plaza: which document says that? Our guides on analyzing primary sources and verifying JFK assassination files show how.

— Mark

Records you can read yourself

You do not need to take anyone's word for this history. A short reading list, in the order we would tackle it:

Warren Commission Exhibit 877, a description of Dealey Plaza's layout and boundaries, hosted in the Warren Commission volumes.

Exhibit 2188, the street history with the 1855 map and 1934 resolutions.

The National Park Service landmark text, with the architectural description and designation history.

The Dallas Municipal Archives New Deal images, for the 1940 landscaping plan.

Chapter 3 of the Warren Commission Report, for the bridge witnesses and the Commission's findings.

If you are teaching this, our primary vs. secondary sources checklist turns the list into a one-hour exercise.

Visiting the Triple Underpass

The underpass is public, outdoors and free to view. Walk the Elm Street side of the plaza toward the bridge, then cross to the Main Street median for the straight-on view of all three openings. Take care near traffic: these are live roads, and the curb is narrow in places.

A few practical tips:

Go early on a weekday for fewer crowds on the curb.

Plan parking before you arrive; see our Dealey Plaza parking guide.

Use a map of the movements that day. Our Movements Map pairs locations with documents.

Combine the visit with the rest of the downtown sites using Dallas JFK sites with archival context or the Dealey Plaza field guide.

For a fuller itinerary, A Day in Dallas on the Record strings the stops together, and Dallas history attractions covers what else to see around town.

Go inside the evidence

Standing at the underpass shows you where. It cannot show you the documents. Escape from the Sixth Floor is our sixty-minute documentary escape room in Dallas, where you reconstruct the events of November 22, 1963 by solving puzzles built from primary documents, Warren Commission findings and period artifacts. There is no fiction and no horror: every puzzle is anchored to public records, and the room separates historical fact from unverified theory.

It suits history enthusiasts, teachers, school and museum groups and teams looking for something different. Start at oswaldescaperoom.com to see how booking works, or read what an escape room costs and why a documentary room is rare before you decide. Teachers can start with choosing evidence over theme for school groups.

When was the Triple Underpass built?

Construction began in 1934, and the underpass opened on May 1, 1936. Austin Bridge Company and Austin Road Company built it with the Texas Highway Department and the City of Dallas.

Who designed the Triple Underpass?

Architect Otto Lang is credited with the plan of funneling Main, Commerce and Elm streets beneath one railroad bridge. The broader Dealey Plaza concept grew from George Kessler's ideas after the 1908 flood.

Was the Triple Underpass part of the JFK assassination?

The limousine was approaching it when the shots were fired, and 15 people were identified on the railroad bridge above. The Warren Commission found no credible evidence of shots from anywhere but the Texas School Book Depository, and the House Select Committee also placed the shots that struck Kennedy there.

Is the Triple Underpass a historic landmark?

Dealey Plaza was locally designated a historic district in 1975 and listed in the National Register in 1978. The underpass is part of that protected landscape and keeps its original Art Deco detailing.

Sources

Reimagining Dealey, The Dallas Morning News

Triple Underpass, ca. 1936, Flashback Dallas

Warren Commission Volume XVII, CE 877

Warren Commission Volume XIV, CE 2188

National Park Service landmark documentation

Dallas Municipal Archives, New Deal images

Warren Commission Report, Chapter 3, National Archives

House Select Committee findings, National Archives