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

This page last updated December 2, 2016

I-35 North highlight map This page covers Interstate 35 north of downtown San Antonio from the I-10 West interchange to FM 482 in Schertz.  For information on I-35 continuing north, see the San Antonio-Austin Corridor page.  For details on I-35 south of downtown, see the I-35 South page.

Length: 20 miles


On this page

(Not yet available)
Lanes Access
Special features
& notes
Traffic Media


This freeway serves the northeast corridor and provides access to Fort Sam Houston, Splashtown water park, the AT&T Center and Freeman Coliseum, San Antonio Military Medical Center, the headquarters for IT services company Rackspace and Randolph Brooks Federal Credit Union, Randolph AFB, Retama Park racetrack, the Forum shopping center, and the cities of Kirby, Windcrest, Live Oak, Converse, Universal City, Selma, and Schertz.  The route is entirely urban and suburban and the majority of the adjacent land use consists of warehouse, light industry, and heavy commercial development.  This route is also the southern continuation of the San Antonio-Austin Corridor and is part of the so-called "NAFTA Superhighway".

There are two interchanges with Loop 410 along this corridor.  Loop 410 North intersects north of Walzem at the Fratt Interchange, and Loop 410 South intersects south of Rittiman at the "410 South Cutoff".  Loop 410 is concurrent (multiplexed) with I-35 in between.

Roadway details

  • 10 lanes double-decked (6 lanes on the upper levels; 4 lanes on the lower level) from I-10 West to I-37/US 281
  • 6 lanes from I-37/US 281 to Loop 410 North (Fratt Interchange)
  • 8 lanes from Loop 410 North to FM 3009 with a short 6 lane section through the Loop 1604 interchange
  • 6 lanes from FM 3009 to FM 482

I-35 lanes map

  • No traditional access roads from I-10 West to I-37/US 281.  However, Elmira St. functions as a southbound access road and Quincy St. functions as a northbound access road.
  • Continuous access roads along most of route north of downtown except:
    • Northbound access road does not continue through the Loop 410 South Cutoff interchange or the Loop 1604 interchange.
    • Northbound access road through-traffic requires a left turn at Binz-Engleman Rd. and at Randolph Blvd.
    • Southbound access road through-traffic requires two left turns at Loop 1604.

I-35 access roads map

Click here for a list of I-35 North exits.
  • 60 mph from I-10 West to Loop 410 North (Fratt Interchange)
  • 65 mph from Loop 410 North to Forum Pkwy
  • 70 mph from Forum Pkwy to FM 482

I-35 speed limit map

  • Double-decked freeway northbound and southbound between I-10 West and I-37/US 281
  • TransGuide coverage along entire route
  • VIA Metropolitan Transit Randolph Park & Ride located adjacent to Fratt Interchange
  • Carpool parking lots at following locations:
    • Shin Oak Dr. (southbound side)
    • Olympia Pkwy. (southbound side)
    • Evans Rd. (under freeway)
  • Four miles of Loop 410 concurrent (multiplexed) from 410 South Cutoff to Fratt Interchange
    • 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

Heavy to extremely heavy along entire route. 

Chronic congestion occurs between Loop 410 NE and Loop 410 South (410 South Cutoff).  Regular morning and afternoon peak-period congestion can be found between Loop 1604 and  Loop 410 South.  Additional afternoon peak period congestion occurs northbound approaching I-37/US 281 and from Splashtown to Loop 410 NE.

Over the past decade, the entire corridor has seen traffic counts increase along the northern half and decrease between downtown and Loop 410.

Traffic volume legend

I-35 traffic map


LOCATION 1990 2005 2010 2013 2014 2015 '05-'15
Guadalupe Co. line 53,000 125,160 149,000 159,373 156,035 169,017 +35.04%
Pat Booker Rd. 58,000 132,930 150,000 174,215 173,718 191,955 +44.40%
O'Connor Rd. 98,000 168,110 182,000 183,732 186,469 196,975 +17.17%
Thousand Oaks 120,000 189,630 200,000 194,913 206,269 217,119 +14.50%
N of Walzem Rd. 111,000 171,680 182,000 192,019 168,425 186,083 +8.39%
S of Walzem Rd. 115,000 170,040 176,000 193,366 159,160 180,103 +5.92%
S of Rittiman Rd. 127,000 182,500 181,000 190,033 157,942 177,352 -2.82%
Binz-Engelmann Rd. 75,000 116,620 107,000 116,361 94,551 111,426 -4.45%
Salado Creek 95,000 138,250 130,000 142,360 116,786 135,550 -1.95%
N. New Braunfels Ave. 111,000 160,510 151,000 159,144 132,744 160,425 -0.05%
McCullough Ave. 90,000 187,220 190,000 196,011 165,292 193,361 +3.28%

Media gallery

Click here for photos and video of this freeway.

Construction projects

  • Loop 410 NE to Loop 410 South: Click here for details on this project.

Click here to view information for all projects in this corridor.

Future plans

A Major Investment Study (MIS) of the corridor conducted in 1996 for the Metropolitan Planning Organization (MPO) suggested the addition of barrier-separated express, truck, and/or HOV lanes to this freeway.  In addition, a "Basic Improvements Package" was also recommended including signal improvements, better signage, ramp modifications, expansion of the TransGuide system, addition of pedestrian facilities and bicycle routes, improved bus service, and operational improvements to both Loop 410 interchanges and the Loop 1604 interchange.  The signal, signage, and TransGuide improvements were completed.  No timetable has been announced for the express/truck/HOV lanes, although these lanes have been proposed to be elevated and built as a likely toll project.  A fully-directional "stack" interchange was proposed at Loop 1604 as part of the Loop 1604 managed lanes project

In October 2011, the city of San Antonio received federal funding as part of a program to assist communities impacted by military base expansions.  The project selected for funding was the conversion of the southbound I-35 left exit to Loop 410 to a right-hand flyover.  That project is expected began in 2014 in conjunction with an expansion of I-35 between Loop 410 NE and Loop 410 South.

In late 2011, TxDOT and the Alamo Regional Mobility Authority began work on a new long-range plan for the I-35 corridor from downtown to FM 1103 including Loop 410 near Kirby.  Public meetings to solicit input were held in November 2011 and again during 2012.


I-35 designation authorized on October 1, 1959.  Named PanAm Freeway because it is the US extension of a segment of the Pan American Highway.  Was originally called the "Northeast Expressway."

The first section of this route, from present-day I-10 West to Broadway, was completed in 1954.  By 1962, it had been extended to Artesia Rd. (now AT&T Center Parkway), and the section north of Fratt (today's interchange with Loop 410 NE) was also open.  The section from Artesia to Rittiman opened in 1961 followed the next year by the section from Rittiman to Fratt.

The section from Loop 410 North (Fratt Interchange) to Loop 1604 was expanded from four to eight lanes and the Fratt interchange rebuilt around 1984.  The section from I-10 West to I-37/US 281 was double-decked in the late '80s and early '90s and was the last section of the massive "Downtown Y" project to be completed in 1993.  The section from Loop 1604 to FM 3009 was widened from four to six lanes in 1992, and the segment between FM 3009 and FM 482 was widened from four to six lanes in 1999.

TransGuide coverage was added to the section from I-10 West to New Braunfels Ave. in 1995, from New Braunfels Ave. to Walzem in early 2000, from Walzem to Starlight Terrace in August 2000, from Starlight Terrace to the Guadalupe County line in April 2003, and from the Guadalupe County line to Austin in 2008.

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