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I-35 San Antonio Area Freeway System
Interstate 35 South (South PanAm Freeway)

This page last updated December 2, 2016

I-35 South highlight map This page covers Interstate 35 west and south of downtown San Antonio from the I-10 West interchange to Loop 1604.  For information on I-35 north of downtown, see the I-35 North page.

Length: 16 miles


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On this page

Overview
 
Roadway
details
Schematic Lanes Access
roads
         
Exits
 
Speed
limits
Special features
& notes
Traffic Media
gallery
         
   
  Construction
projects
Future
plans
History
 
 
         

Overview

With the passage of NAFTA and the boom of the Eagle Ford Shale oilfield south of San Antonio, I-35 South has become an increasingly important spoke in San Antonio's freeway system.  This segment serves the city's southwest side and continues on to Laredo, the busiest US-Mexico border crossing.  This corridor is also an important component in the continuing development of Port San Antonio.

This segment serves downtown San Antonio, Market Square, the University of Texas at San Antonio downtown campus, the San Antonio Produce Market, South Park Mall, Palo Alto College, the Toyota assembly plant, and a growing logistics and industrial area at Loop 410 as well as the cities of Von Ormy and Somerset.  Commercial and industrial development fronts the freeway near downtown.  Residential and some commercial development lines the corridor south of US 90 to Somerset Rd. Mostly undeveloped land takes over south of Somerset Rd. to Loop 410.  South of Loop 410, light industrial areas and two rail yards sit on the west side of the freeway between Loop 410 and Von Ormy.


Roadway details

SCHEMATIC

Click here for a schematic of I-35 South.
 
LANES
  • 8 lanes from I-10 West to Laredo St. with a short double-decked stretch (4 lanes on the upper levels; 4 lanes on the lower level) from Guadalupe St. to S. Alamo St.
  • 9 lanes (4 southbound, 5 northbound) from Laredo St. to US 90
  • 6 lanes from US 90 to Spur 422/Poteet-Jourdanton Hwy.
  • 4 lanes from Spur 422/Poteet-Jourdanton Hwy. to Loop 1604

I-35 lanes map
 

   
ACCESS ROADS
  • No traditional access roads along most of the route from I-10 West to US 90, although S. Pecos-La Trinidad and S. Laredo function as access roads along parts of the route and a short access road exists southbound from San Marcos St. to Nogalitos.
  • Continuous access roads along most of remainder of route
  • Access roads do not continue through Loop 410 interchange or over the Medina River
     

I-35 access roads map
 

   
EXITS


Click here for a list of I-35 South exits.

 
SPEED LIMITS
  • 60 mph from I-10 West to Loop 410
  • 70 mph from Loop 410 to Loop 1604
     

I-35 speed limit map
 

   
SPECIAL FEATURES & NOTES
  • Double-decked freeway from just north of S. Alamo to just south of S. Laredo
  • TransGuide coverage from I-10 West to Southcross
  • VIA Metropolitan Transit Madla Transit Center/Park & Ride just north of Zarzamora
  • Northbound left exit to Loop 353
  • Two miles of I-10/US 87 concurrent (multiplexed) from I-10 West to US 90
    • US 81 was concurrent (multiplexed) over I-35 in Bexar County before it was decommissioned south of Ft. Worth in 1991

I-35 special features map
 

   
TRAFFIC

Generally heavy from I-10 West to SW Military.  Moderate to light volumes south from there.  Regular peak-period congestion can be found northbound in the morning between Division and Cesar Chavez and in the evening in both directions between I-10 West and US 90.

Overall, the corridor has generally seen traffic growth over the past decade with the biggest increases south of Military Dr.
 

Traffic volume legend

I-35 traffic map
 

   

AVERAGE ANNUAL DAILY TRAFFIC
LOCATION 1990 2005 2010 2013 2014 2015 '05-'15
% CHG
S. Laredo St.79,000170,190159,000182,781150,358173,964+2.22%
Theo Ave.92,000149,890135,000149,550127,987152,614+1.82%
N of SW Military Dr.59,000108,34077,000110,397105,191113,122+4.41%
S of SW Military Dr.34,00068,63068,00074,43576,80280,924+17.91%
S of Palo Alto Rd.18,80041,76038,00041,06844,79345,892+9.89%
N of New Laredo Hwy.17,00037,75035,00039,00039,00043,677+15.70%
Fischer Rd.21,00039,32042,00041,69647,41954,741+39.22%


Media gallery

Click here for photos and video of this freeway.


Construction projects

No current projects in this corridor.


Future plans

The MPO's 25-year plan has proposals for the expansion of I-35 to eight lanes from US 90 to the Atascosa County line.

A new expressway (Kelly Parkway) roughly paralleling this section of I-35 is proposed as part of the Port San Antonio long-range road improvements package.  It would run north from SH 16 near the Toyota plant to US 90 via General Hudnell, crossing I-35 between Spur 422 and Loop 410.

A fully-directional "stack" interchange at Loop 410 is included in future plans to upgrade SW Loop 410.


History

I-35 designation authorized on October 1, 1959.  Named PanAm Freeway because it is supposedly a segment of the Pan American Highway.  Was originally called the "Southwest Expressway."  This freeway is also part of the so-called NAFTA Superhighway.

The section from S. Alamo to Nogalitos was completed by 1951.  The segment north of that to present-day I-10 West was completed by 1957.  There were two proposals for the section from Nogalitos to Loop 410, including one that would have usurped Nogalitos and New Laredo Hwy.  The final routing was approved by 1957 and open to traffic by 1964.  The section from I-10 West to US 90 was expanded in the late '80s.  The section from SW Military to Spur 422 was expanded from four to six lanes around 1989.  TransGuide coverage was added to the section from I-10W to Southcross in 1995.  The section from US 90 to SW Military was reconstructed ca. 2009.  The reconstruction removed several pedestrian overpasses, expanded the overpasses and frontages roads, and relocated several entrance and exit ramps.  The section from Zarzamora to Somerset was reconstructed during the same time frame.  That project removed the previous southbound left-hand exit to SP 422 and the northbound left-hand exit to Palo Alto Rd., extended the northbound frontage road through the Spur 422 interchange, and adjusted several roadways and ramps in the vicinity.




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