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I-37 San Antonio Area Freeway System
Interstate 37 (Lucian Adams/Wm. J. Bordelon Freeway)

This page last updated May 14, 2018

I-37 highlight map This page covers Interstate 37 east and south of downtown San Antonio from I-35 to US 181. This freeway continues north of downtown as US 281 North.

Length: 11 miles


On this page

Schematic Lanes Access
Special features
& notes
Traffic Media


Interstate 37 serves San Antonio's southeast side and intersects with US 181, the main link to Wilson County. The freeway provides access to downtown San Antonio, the Alamodome, St. Paul Square, Brooks City-Base, the San Antonio Missions Trail National Park, San Antonio State Hospital, and San Antonio State School. The freeway also leads to the booming Eagle Ford oilfield south of the city. Between downtown and SE Military, the freeway is fronted mostly by residential areas. From SE Military to US 181, most of the frontage is undeveloped.

Roadway details


Click here for a schematic of I-37.
  • 8 lanes from I-35 to S. New Braunfels Ave. with a short six lane stretch through the I-10 interchange
  • 6 lanes from New Braunfels Ave. to Military
  • 4 lanes from Military to Loop 410
  • 5 lanes (3 northbound, 2 southbound) from Loop 410 to US 181

I-37 lanes map


There are no continuous access roads along this freeway. Short sections of access road exist between Florida and Carolina, between Hackberry and Fair, between Cesar Chavez and Commerce, and along the west side of the freeway from Presa to Blue Wing (at US 181.)



Click here for a list of I-37 exits.

  • 70 mph from US 181 to Loop 410
  • 65 mph northbound/70 mph southbound from Loop 410 to SE Military Dr.
  • 65 mph from SE Military Dr. to Brooklyn Ave.
  • 60mph from Brooklyn Ave. to I-35

I-37 speed limit map

  • TransGuide coverage along entire route
  • Northbound left exit to southbound I-35
  • US 281 concurrent (multiplexed with I-37) from I-35 to Loop 410

I-37 special features map


Heavy in the downtown area. Heavy to moderate south of I-10. Recurring morning congestion occurs NB in the downtown area.

Traffic volumes have grown significantly along the entire corridor over the past decade.

Traffic volume legend

I-37 traffic map


LOCATION 1990 2007 2010 2015 2016 2017 '07-'17
S of I-35119,000129,000129,000147,952155,523159,575+23.70%
Cesar Chavez Blvd.96,000117,000115,000130,531133,949135,577+15.88%
Fair Ave.71,000119,000104,000138,218140,340137,758+15.76%
N of Hot Wells Blvd.43,00090,00071,000100,664103,013102,196+13.55%
N of SW Military Dr.29,00074,00057,00084,639109,102113,023+52.73%
N of Loop 41021,00061,00046,00072,38188,68488,867+45.68%
N of US 18125,00071,00050,00083,61084,71682,801+16.62%

Media gallery

Click here for photos and video of this freeway.

Construction projects

No current projects in this corridor.

Future plans

The MPO has an unfunded proposal in its 25-year plan to expand I-37 from four to six lanes from Loop 410 south to the Atascosa County line. TxDOT is planning to convert the I-37/Military intesection to a diverging diamond interchange.


Authorized on October 1, 1959. The section south of I-10 is named for Lucian Adams and the section north of I-10 is named for William J. Bordelon, both World War II Medal of Honor recipients. Was originally named the "Southeast Expressway."

The route was first proposed by 1964. All of the route south of Florida St. to US 181 was complete by 1969. The section north of Florida St. and adjacent to the present-day HemisFair Park was paved in early 1968 for use as parking for the 1968 World's Fair. It was later completed as a freeway north to I-35 by 1971.

Access roads along most of the route south of I-10 were proposed in the late '80s but were never built.

TransGuide went online from Fair to I-35 in 1995. Work to raise the overpasses at Pecan Valley, S New Braunfels, and Southcross was completed in 2009-2010. The former cloverleaf interchange at SE Military was removed and replaced with a diamond interchange in 2010. The section south of Loop 410 to US 181 was improved in 2009 to better facilitate hurricane evacuations from Corpus Christi and South Texas.

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This page and all its contents are Copyright 2019 by Brian Purcell

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