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

This page last updated May 10, 2019

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, the AT&T Center and Freeman Coliseum, Splashtown water park, 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 and forthcoming Live Oak Town Center shopping areas, a significant portion of the region's warehouse space, and the suburban 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, is part of the so-called "NAFTA Superhighway", and is on one leg of the Pan American Highway.

There are two interchanges with Loop 410 along this corridor. Loop 410 North intersects with I-35 north of Walzem and has traditionally been referred to as the "Fratt Interchange". 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 South (Loop 410 South Cutoff)
  • 8 lanes from Loop 410 South 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 1604 interchange 
    • Northbound access road through-traffic requires a left turn at Binz-Engleman Rd.
    • 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 (Park & Pool) 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. 

Regular morning peak-period congestion can be found southbound from FM 3009 to Loop 410 NE. Afternoon peak period congestion occurs northbound approaching I-37/US 281 and from Rittiman Rd. to Evans Rd.

Over the past decade, the entire corridor has seen traffic counts increase with the biggest increases on the northern end.

Traffic volume legend

I-35 traffic map


LOCATION 1990 2007 2010 2015 2016 2017 '07-'17
N of FM 2252    142,678120,233N/A
Wiederstein Rd.    144,784121,936N/A
FM 3009    175,832153,820N/A
Guadalupe Co. line53,000139,000149,000169,017188,025172,800+24.32%
S of Loop 160458,000155,000150,000191,955199,886165,061+6.49%
N of O'Connor Rd.98,000186,000182,000196,975212,692197,824+6.36%
S of Thousand Oaks120,000210,000200,000217,119233,278218,058+3.84%
N of Walzem Rd.111,000184,000182,000186,083202,556191,564+4.11%
S of Walzem Rd.115,000179,000176,000180,103194,518210,091+17.37%
S of Rittiman Rd.127,000185,000181,000177,352190,907179,075-3.20%
N of Binz-Engelmann Rd.75,000113,000107,000111,426124,373124,529+10.20%
Salado Creek95,000137,000130,000135,550147,739142,003+3.65%
W of New Braunfels Ave.111,000158,000151,000160,425171,940166,941+5.66%
N of McCullough Ave.90,000195,000190,000193,361202,232196,505+0.77%

Media gallery

Click here for photos and video of this freeway.

Construction projects

No current projects in this corridor.

Future plans

A Major Investment Study (MIS) of the corridor conducted in 1996 for the Metropolitan Planning Organization (MPO) recommended 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. The express/truck/HOV lanes had been proposed as a toll project, but now will be built as non-toll lanes (see below.) 

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 exit. That project began in 2014 in conjunction with an expansion of I-35 between Loop 410 NE and Loop 410 South and was completed in mid 2018.

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. The resulting project called for the addition of four elevated tolled/managed lanes (i.e. two in each direction.) In the wake of new funding from the legislature and a deprecation of tolling, this project was modified in mid 2018 to drop the tolling component and instead add four elevated express lanes (i.e. two in each direction) and two elevated HOV lanes (i.e. one in each direction.) The project will likely be done in three phases with the first phase, from Loop 410 North to FM 3009, possibly starting construction in 2020. A fully-directional "stack" interchange at Loop 1604 was previously proposed as part of the Loop 1604 managed lanes project, but now connectors to the new elevated lanes from Loop 1604 will likely be built as part of the I-35 project.

I-35 For more information on the planned I-35 Northeast Expansion (NEX), see the I-35 Northeast Expansion Project page.


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

The first section of this route, from Martin St. to Broadway, was completed in 1954 as part of a downtown bypass for US 81. The section from Broadway to Rittiman opened in 1961 and the section north of Fratt (today's interchange with Loop 410 NE) to Pat Booker was also open by this time. The section from Rittiman to Fratt had already existed since around 1952 as a two-lane road that was part of Loop 13; work to upgrade it to Interstate standards was completed around 1963.

The section from Loop 410 North (Fratt Interchange) to Loop 1604 was expanded from four to eight lanes and the Fratt interchange (I-35/Loop 410 NE/Austin Highway) rebuilt around 1984.

The double-decked section from I-10 West to I-37/US 281 was the last section of the massive "Downtown Y" project to be completed and opened 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. The section from Loop 1604 to FM 3009 was widened to eight lanes in 2014 along with interchange improvements at Loop 1604 and an additional southbound lane from Loop 1604 to Judson.

The section between Loop 410 North and the Loop 410 South Cutoff was widened from six to eight lanes and the Loop 410 South Cutoff interchange was reconfigured in 2018.

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

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