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I-10 San Antonio Area Freeway System
Interstate 10 West (Robert F. McDermott Freeway)

This page last updated November 14, 2020

I-10 West highlight map This page covers Interstate 10 northwest of downtown San Antonio from I-35 to Ralph Fair Rd. Two miles of I-10 is concurrent (multiplexed) with I-35 south of this segment; see the I-35 South page for details. Interstate 10 continues east of downtown; see the I-10 East page for more info.

Length: 16 miles


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On this page

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

Overview

This segment of I-10 serves the northwest corridor, one of the fastest growing areas of the city. A tremendous amount of the region's suburban office space is located in this corridor as are the headquarters for several large companies. The corridor also serves the bustling and continually-growing South Texas Medical Center district; Wonderland of the Americas mall (formerly known as Crossroads mall); the University of Texas at San Antonio's (UTSA) main and downtown campuses; Six Flags Fiesta Texas; Joint Base San Antonio Camp Bullis and Camp Stanley; and The Rim, La Cantera, Landmark, Colonnade, Huebner Oaks, and Fiesta Trails retail centers and mixed-use developments. One suburban city, Balcones Heights, also lies within the corridor as does the unincorporated Leon Springs area. I-10 continues northward to the booming outlying areas of Fair Oaks Ranch, Boerne, and Kendall County. Inside Loop 410, the route is lined with light industrial and residential areas. Heavy commercial development dominates the landscape between Loop 410 and La Cantera Blvd., with moderate and growing commercial and residential development north of there all the way to Boerne.


While it is signed as east/west, this segment actually runs mostly north/south. To avoid confusion, many locals give directions as "inbound" or "outbound" (from downtown) instead; I use that convention here.

Roadway details

LINE SCHEMATIC

Click here for a line schematic of I-10 West.
 
LANES
  • 10 lanes double-decked (6 lanes on the upper levels; 4 lanes on the lower level) from I-35/Frio St. to Fulton Ave.
  • 10 lanes from Fulton Ave. to Loop 410 with a short 8 lane section through the Loop 410 interchange.
  • 11 lanes (5 inbound, 6 outbound) from Loop 410 to Wurzbach Rd.
  • 8 lanes from Wurzbach Rd. to Huebner Rd.
  • 9 lanes (5 inbound, 4 outbound) from Huebner Rd. to Loop 1604.
  • 6 lanes from Loop 1604 to Ralph Fair Rd.

  • 2 HOV lanes (one each direction) from La Cantera Blvd. to Ralph Fair Rd.

I-10 lanes map

   
ACCESS ROADS
  • Continuous access roads from I-35 to Frio St.
  • No continuous access roads from Frio St. to Woodlawn Ave., except on the inbound side between Woodlawn Ave. and Culebra Ave.
  • Continuous access roads along remainder of route north of Woodlawn Ave.
  • Westbound access road splits in Leon Springs. The west leg continues along the freeway and ends at Boerne Stage Rd. The east leg passes through Leon Springs and then continues northward to Ralph Fair Rd.
  • Access road intersection bypass at Medical Dr. (both directions).

I-10 access roads map

   
EXITS

Click here for a list of I-10 West exits.
 
SPEED LIMITS
  • 60 mph from I-35 to Fulton St.
  • 65 mph from Fulton to La Cantera Blvd.
  • 70 mph from La Cantera Blvd. to Ralph Fair Rd.

I-10 speed limit map

   
SPECIAL FEATURES & NOTES
  • US 87 concurrent (multiplexed) along entire route.
  • Double-decked from Frio St. to Hildebrand Ave.
  • TransGuide coverage from I-35 to Camp Bullis Rd.
  • VIA Metropolitan Transit Park & Ride locations:
    • Crossroads: Crossroads Blvd.
    • University: Loop 1604 (under interchange)
  • Left exit to I-35 northbound.
  • Special double-height bridge rail barrier on ramp to I-35 northbound.
  • Unusual yield sign arrangement at Loop 1604 interchange; click here for more information.
  • Two waterways run longitudinally below the freeway:
    • Martinez Creek between West Ave and Fresno Ave.
    • San Pedro Creek between Frio St. and I-35

I-10 special features map

   
TRAFFIC
Heavy to extremely heavy along entire route.

Regular morning and afternoon peak-period congestion occurs on the approaches to Loop 410 and I-35. 

Traffic counts outside Loop 1604 have increased substantially over the past decade.
 

Traffic volume legend

I-10 traffic map

   
AVERAGE ANNUAL DAILY TRAFFIC
LOCATION 1999 2009 2014 2017 2018 2019 '09-'19
% CHG
N of Frio St.175,000179,000174,167186,907186,873187,306+4.64%
N of Crossroads Blvd.163,000180,000189,164205,971206,752206,072+14.48%
S of Callaghan Rd.176,000212,000187,026241,428243,307241,130+13.74%
N of Huebner Rd.114,000149,000187,590184,794184,858182,384+22.41%
S of DeZavala Rd.138,000205,000200,231204,596205,797199,029-2.91%
N of UTSA Blvd.99,000153,000169,707158,415158,207156,092+2.02%
N of Loop 160465,000107,000127,952117,410121,250121,393+13.45%
N of Dominion Dr.54,00076,00085,81893,14099,59898,299+29.34%
N of FM 335139,00051,00060,30366,20575,97580,745+58.32%


Media gallery

Click here for photos and video of this freeway.


Construction projects

  • La Cantera Blvd. to Ralph Fair Rd.: Widen freeway to six general purpose lanes plus two HOV lanes. Click here for details on this project.

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


Future plans

TxDOT plans to add one general purpose lane and one HOV lane in each direction from Ralph Fair Rd. to Boerne. There is currently no funding or timeline for that expansion

A fully-directional "stack" interchange was proposed at Loop 1604 as part of the Loop 1604 managed lanes project. It will now be built as part of the Loop 1604 North expansion project.


History

The section from Fredericksburg Rd. at Woodlawn Ave. to Culebra Ave. was San Antonio's first expressway.

Most of the route from just north of Huebner Rd. to Leon Springs was part of the original route of US 87 and its predecessors US 290, US 385, SH 9, and SH 27. The short section of Old Fredericksburg Rd. at Loop 1604 was bypassed by the current route in 1934 as part of the Arneson Plan to improve state highways in Bexar County. The section of I-10 today north of Leon Springs was also built in 1934 as part of the Arneson Plan; prior to that, the route followed Boerne Stage Rd.

The first freeway sections to be built were simply called "US 87 Expressway". It was briefly called the "North Expressway" before being named the "Northwest Expressway" when planning began for the US 281 "North Expressway". The designation as I-10 was authorized on October 1, 1959. The route was renamed as "McDermott Freeway" ca. 1995 for Robert F. McDermott, the former CEO of the USAA financial services corporation whose headquarters are located adjacent to the freeway south of Huebner Rd. 

  • Late 1930s: The section from Woodlawn Ave. to downtown was included as part of the original three-legged expressway plan for San Antonio designed to provide bypass routes around downtown for through traffic on the various US and state highways. The United States' entrance into World War II delayed these plans until after the war.
  • July 8, 1949: The section from Fredericksburg Rd. at Woodlawn Ave. to Culebra Ave. opened without fanfare. This was the first expressway in San Antonio and appears to be the second in Texas, coming less than a year after the Gulf Freeway opened in Houston and a month before the opening of Central Expressway in Dallas.
  • November 28, 1949: The section from Culebra Ave. to Frio St. opened with the official ribbon-cutting for the entire Woodlawn Ave. to Frio St. section.
  • November 1950: The segment from Frio St. to Martin St. was completed.
  • 1957: "Downtown Y" interchange completed. Alignment finalized for the routing of the section from Woodlawn Ave. to De Zavala Rd. A previous proposal in 1953 had I-10 further east crossing Loop 410 at Vance-Jackson Rd. 
  • April 1960: The section from Loop 410 to Fredericksburg Rd. north of Huebner Rd. was completed including the interchange at Loop 410.
  • October 1960: The segment from Woodlawn Ave. to Fresno Dr. opened.
  • November 1961: The section from Fresno Dr. to Loop 410 was completed.
  • 1966: The section from Dominion Dr. to Boerne opened.
  • 1967: The ramps connecting I-35 North to and from I-10 West in the "Downtown Y" interchange were completed. Prior to this, there were only direct connections between I-35 South and I-10 West. Traffic headed to and from I-35 North had to exit and use the access roads
  • 1968: The existing segment of US 81 from Fredericksburg Rd. near Huebner to Dominion Dr. was upgraded to a freeway.
  • 1982: First phase of Loop 1604 interchange completed.
  • 1983-1994: Reconstruction and double-decking from I-35 to Hildebrand Ave.
  • 1987: Loop 1604 interchange completed.
  • 1991: The segment from Loop 1604 to Camp Bullis Rd. widened from four to six lanes.
  • 1992: The music group REM filmed the video for their song "Everybody Hurts" on the lower level at Woodlawn Ave. Producers had originally wanted to use US 281 North at Loop 1604, but decided it looked too wide in camera shots.
  • 1993: The section from Loop 1604 south to Fredericksburg Rd. (near Huebner) widened from four to six lanes.
  • 1995: TransGuide coverage added to the section south of Hildebrand Ave. as part of the original TransGuide project.
  • 1996: The segment from Fredericksburg Rd. south to Wurzbach Rd. was expanded from four to eight lanes.
  • 1998: The section from Wurzbach Rd. to Callaghan Rd. was widened from four to eight and 10 lanes.
  • 1999: TransGuide coverage added from Hildebrand Ave. to Camp Bullis Rd.
  • 2000-2009: Loop 410 interchange reconstructed.
  • 2008: The section from Crossroads Blvd. to Fulton Ave. was widened from six to 10 lanes.
  • 2009: Dominion Dr. overpass completed and access roads between Camp Bullis Rd. and Dominion Dr. converted to one-way.
  • 2011: Reconstruction from Camp Bullis Rd. to Dominion Dr. to raise and lengthen the Camp Bullis overpass and improve drainage was completed.
  • 2016: The section from Ramsgate Dr. to Loop 1604 was widened from six to eight lanes.
  • 2017: Conversion of access roads to one-way and other improvements from Dominion Dr. to Leon Springs completed.
  • 2020: The section from La Cantera Blvd. to Ralph Fair Rd. widened to six lanes plus two HOV lanes.



I-10 at Woodlawn Ave. looking north in 1949
The freeway ended here and curved up to Fredericksburg Rd.
(Photo courtesy of TxDOT)




I-10 at Frio St. looking southeast in 1950
(Photo courtesy of TxDOT)




Snippet of 1953 plan for routing of US 87 (I-10) in the vicinity Loop 13 (Loop 410)
Note the location of the planned US 87/Loop 13 interchange between Vance-Jackson Rd. and Jackson-Keller Rd.
(Document courtesy of TxDOT)





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