Interstate 635 Texas

Interstate 635 Texas


Part of the Dallas beltway system, Interstate 635 (Lyndon B. Johnson Freeway) wraps around the northern and eastern side of the city. Known simply as the LBJ Freeway, IH 635 begins at Interstate 20 in Balch Springs and leads in a counterclockwise direction through Mesquite to Garland, Farmers Branch and IH 35E (Stemmons Freeway). Beyond IH 35E, IH 635 spurs 8.50 miles west through Farmers Branch, Irving and along the Coppell city line to SH 121 in the city of Grapevine. SH 121 links IH 635 with International Parkway south through Dallas-Fort Worth International Airport (DFW) and north to Lewisville.

LBJ Express lanes

A $2.6 billion project rebuilt 10.7 miles of the Lyndon B. Johnson Freeway to September 10, 2015.1 The massive project kicked off with an allocation of $50 million from the Regional Transportation Council on September 11, 2003.2 Initial plans called for twin bored tunnels below the main travel lanes of IH 635. These were cost prohibitive and eventually withdrawn from the plan. Project revisions in November 2006 replaced the tunnels with trenched roadways (later named the LBJ Canyon) utilizing space under a portion of the IH 635 general travel lanes. The cost savings allowed the project to move forward, with construction commencing in 2011.3

The LBJ Express project upgraded IH 635 between the Central Expressway (US 75) and IH 35E, with the addition of two or three tolled lanes per direction. Formally named the LBJ Express or LBJ TEXpress, the new lanes utilize variable tolling where rates increase during periods of traffic congestion along the main lanes of IH 635.

The I-635 East HOV/Express Lanes were converted from high occupancy vehicle lanes to high occupancy toll (HO/T) lanes on October 1, 2016.4 Operated by the Texas Department of Transportation (TxDOT), the express lanes allow non HOV traffic to use the lanes at a variable toll rate.

A $1.7 billion design-build project rebuilds the HOV/Express Lanes into the I-635 East TEXpress Lanes along an 11 mile long section of IH 635, from U.S. 75 (Central Expressway) to IH 30. Started in Spring 2020, work expands the freeway to ten overall general travel lanes and two managed toll lanes. Construction to late 2024 also rebuilds the multi level interchange joining IH 30/635.

DFW Connector Project

Approved for Texas Clear Lanes congestion relief funding in March 2017, work on the $370 million, I-635/SH 121 Project started in August 2018. Construction widened SH 121 through a rebuilt interchange with IH 635, added direct connectors to SH 26 and FM 2499 and expanded the Bass Pro Drive overpass.5 Included in the $1 billion DFW Connector Project, which greatly expanded 8.4 miles of SH 114 and SH 121 through Grapevine, Southlake and Irving by March 2014, construction at the west end of IH 635 reached substantial completion in August 2021.


Right of way acquisition for what would be Interstate 635 commenced in 1958 across mostly empty farm land or prairie. Construction started in March 1964 on a short segment between IH 35E and Marsh Lane by the city of Farmers Branch. This section was complete on March 23, 1967. It was quickly followed with opening of IH 635 east from Marsh Lane to U.S. 75 (Central Expressway) in August 1967.3

Work continued to build IH 635 south and east to IH 30 in November 1968, with work finished south to IH 20 by August 1970. The portion running west from Balch Springs to IH 35E in south Dallas was redesignated as IH 20 in 1971. It was completed in October 1973.3

The northwestern segment of Interstate 635 was constructed in 1981-82. Previously requested by the Texas Highway Department on March 29, 1974, Federal Highway Administration (FHWA) granted approval for the 9.5 mile long addition to IH 635 under authorization of 23 U.S.C., section 103(e)(1). The department subsequently petitioned the American Association of State Highway and Transportation Officials (AASHTO) for approval on July 31, 1974:

The U. S. Route Numbering Committee considered your Department’s application for the extension of Interstate Loop 635 northwest of Dallas. The Committee concurred in your application, subject to the understanding that eventually the western terminus of this route will be continued, so that it does, in fact, complete a loop connecting with another Interstate route.

AASHTO approved the request on November 16, 1974, with the following attached letter dated November 18, 1974:

This proposed route is located in one of the fastest growing major population centers in the nation and will connect the Interstate
Highway System with a jetport that can, and will, be utilized by the military in case of national emergency. The Dallas-Fort Worth area is fast becoming one of the major population centers in the United States. It is anticipated that more than 50% of the Dallas traffic will enter the jetport from the north using this proposed route, which by 1980 is estimated to carry 70,000 vehicles per day.

Route Information

  • North End – Grapevine, TX

  • South End – Balch Springs, TX

  • Mileage – 37.00

  • Cities – Dallas, Balch Springs, Mesquite, Garland, Richardson, Farmers Branch, Irving, Coppell, Grapevine

  • JunctionsI-20 I-30 I-35E

Source: December 31, 2021 Interstate Route Log and Finders List

I-635 Annual Average Daily Traffic (AADT)

Dallas, TX - 1971
Interstate 635 completed to southeast Dallas – 1971 Texas Official Highway Map.

The 1973 Texas Official Highway Map shows IH 20/635 cosigned west from Balch Springs to IH 35E in south Dallas.

LBJ Express lanes west at SH 289 - Dallas, TX
Slip ramps join the LBJ Express lanes with the I-635 Service Roads ahead of SH 289 (Preston Road). Photo by Justin Cozart (09/11/15).

The LBJ Express Lanes travel below grade between Webb Chapel Road and the Dallas North Tollway and from the Dallas North Tollway to Hillcrest Road.

 Photo Guides

North End SH 114 SH 121 – Grapevine, Texas

I-635 West at SH 121 SH 114

IH 635 west at SH 121 - Coppell, TX

IH 635 straddles the Irving and Coppell city line northwest to the diamond interchange (Exit 35) with Royal Lane preceding SH 121. Photo by Matt Tharp (10/09/16).

IH 635 west at SH 121 - Coppell, TX

Crossing over Royal Lane, IH 635 advances west to the Tarrant County and Grapevine city line at the split of Exit 36 for SH 121. 08/06/19

IH 635 west at SH 121 - Coppell, TX


IH 635 west at SH 121 - Grapevine, TX

Photo by Matt Tharp (10/09/16)

Exit 36 A separates into ramps for SH 114/121 south to Southlake and Fort Worth, SH 114 east to Irving and International Parkway south to Dallas Fort Worth International Airport (DFW).

IH 635 west at SH 121 - Grapevine, TX

Exit 36 B partitions with a ramp to Bethel Road east and Bass Pro Drive. A distributor roadway continues northward to FM 2499 (Grapevine Mills Parkway) for Flower Mound and SH 121 northeast to Lewisville. Photo by Matt Tharp (10/09/16).

IH 635 west at SH 121 - Grapevine, TX

The flyover for SH 121 south separates into ramps for International Parkway to Dallas-Fort Worth International Airport (DFW) / SH 114 east and the SH 121 mainline to SH 114 west through Grapevine. 08/06/19

SH 121 North at I-635

SH 121 north at IH 635/SH 114 - Grapevine, TX
SH 121 north at IH 635/SH 114 - Grapevine, TX

SH 121 northbound partitions with ramps for International Parkway south, SH 114 east to Dallas and a flyover for IH 635 (LBJ Freeway). This exchange was rebuilt during the first phase of the DFW Connector Project. 08/06/19

SH 121 South at I-635

FM 2499/SH 121 south at IH 635 - Grapevine, TX

FM 2499 (Grapevine Mills Parkway) ties into a ramp system joining SH 121 southbound with SH 26 and IH 635 east. 08/06/19

South End I-20 – Balch Springs, Texas

I-635 South at I-20

IH 635 south at IH 20 - Balch Springs, TX

A directional ramp (Exit 1 C) leads east from IH 635 southbound onto IH 20 at Seagoville Road. 08/06/19

IH 635 south at IH 20 - Balch Springs, TX

Eastbound IH 20 vacates the Dallas area en route to Terrell in 20 miles. 08/06/19

IH 635 south at IH 20 - Balch Springs, TX

Milepost zero is located just beyond the Seagoville Road underpass. The systems interchange joining IH 20 with U.S. 175 (C.F. Hawn Freeway) lies just to the southwest. 08/06/19

I-20 East at I-635

IH 20 east at US 175/IH 635 - Dallas, TX

IH 20 turns northeast through the multi level interchange with U.S. 175 (C.F. Hawn Freeway) to the immediate south of IH 635 (Lyndon B. Johnson Freeway). U.S. 175 originates in Dallas and travels east to Seagoville, Crandfall and Kaufman. 08/06/19

IH 20 east at IH 635 - Balch Springs, TX

Guide signs for IH 635 were originally without control cities. When IH 20 was completed across south Dallas and IH 635 was truncated east to Balch Springs, Mesquite was added for the LBJ Freeway at Exit 480. Garland was added to signs by 2000. 08/06/19

US 175 ramps to IH 20/635 - Balch Springs, TX

The flyover from U.S. 175 (Hawn Freeway) east partitions into ramps for IH 635 north and IH 20 east adjacent to the Interstate 20 mainline. Photo by Jeff Royston (08/19/02).

IH 20 east at IH 635 - Balch Springs, TX

Entering the directional T interchange (Exit 480) with IH 635 north on IH 20 in Balch Springs. IH 20 travels through southern reaches of Mesquite to Terrell. The LBJ Freeway branches north to central Mesquite and IH 30. 08/06/19

I-20 West at I-635

IH 20 west at IH 635 - Balch Springs, TX

One mile ahead of IH 635 (Exit 480) on IH 20 west at the Seagoville Road underpass. Hazardous cargo based transport is permitted on both IH 20 and IH 635 around the city of Dallas. The two freeways stay 12 to 14 miles out from the city center. 08/06/19

IH 20 west at IH 635 - Balch Springs, TX

The entrance ramp from Seagoville Road adds a short auxiliary lane for Exit 480 A (Kleberg Road) just ahead of the directional T interchange (Exit 480 B) with the LBJ Freeway north. 08/06/19

IH 20 west at IH 635 - Balch Springs, TX

IH 635 arcs northwest toward Richardson and Farmers Branch. IH 20 runs across south Dallas between Hutchins and Duncanville. The Dallas city center lies 13 miles to the northwest. Downtown Fort Worth is 46 miles to the west. 08/06/19

U.S. 175 East at I-20 I-635

US 175 east at IH 20/635 - Dallas, TX

U.S. 175 (C.F. Hawn Freeway) ties into IH 20 just south of IH 635 (Lyndon B. Johnson Freeway) in southeast Dallas. 05/10/22

US 175 east at IH 20/635 - Dallas, TX

The flyover linking U.S. 175 (Hawn Freeway) with IH 20 east includes a ramp onto the northbound beginning of IH 635 north. 05/10/22

US 175 east at IH 20/635 - Dallas, TX

U.S. 175 and IH 20 converge at a four level interchange. 05/10/22

I-635 North

IH 635 milepost zero - Balch Springs, TX

A begin sign for IH 635 appears along the connection from IH 20 east to the LBJ Freeway north beyond the gore point (Exit 1 A) for Seagoville Road. 08/06/19

I-635 South End Throwback

IH 635 south at IH 20 - 2003

This end shield preceded the Seagoville Road off-ramp at Exit 1 A. It was replaced with a southbound confirming marker by 2011. 10/19/03

IH 635 south at IH 20 - 2003

Guide signs at the south end of IH 635 were replaced by 2007 to use Clearview font. Tyler was also dropped as a second control city for IH 20 east. 10/19/03

IH 20 east at US 175/IH 635 - 2003

Sign changes made by the early to mid 1990s added Tyler in addition to Shreveport, Louisiana for IH 20 east. Photo by Chris Patriarca (06/20/03).


  1. Editorial: Zippier, glitzier version of LBJ needs its own instruction manual.The Dallas Morning News, September 9, 2015.
  2. “1st step for LBJ project.” The Dallas Morning News (TX), September 12, 2003.
  3. Chapter 6 Excerpt: Interstate 635 LBJ Freeway, Dallas-Fort Worth Freeways, 2014 ebook.
  4. I-635 East TEXpress Lanes Project Fact Sheet. Texas Department of Transportation (TxDOT).
  5. DFW Connector Tracker – 050119-connector-tracker.pdf

Page updated June 6, 2022.