# Interstate 410

Interstate 410 (I-410), colloquially Loop 410, is an auxiliary route of I-10 around San Antonio, Texas. It is identified as the Connally Loop in honor of former Texas Governor John Connally.

## Route description

I-410 circumnavigates the city of San Antonio, officially beginning and ending at the junction with I-35 on the southwest side of the loop. There are vast differences between the northern arc and southern arc of the loop. The northern arc serves the heavily urbanized portions of San Antonio and is currently being widened to as many as five lanes in each direction. The southern arc resembles more of a rural Interstate as it transverses, for the most part, undeveloped portions of San Antonio as a four-lane Interstate. I-410 intersects I-10 twice, I-35 twice, I-37 once, as well as U.S. Highway 90 (US 90), US 281, and State Highway 151 (SH 151), all freeways in Greater San Antonio with the exception of Loop 1604, which forms a secondary loop around the city, and Wurzbach Parkway, which is located about two miles (3.2 km) outside the loop on the north side. I-410 serves San Antonio International Airport, Lackland Air Force Base, Fort Sam Houston, the South Texas Medical Center, Southwest Research Institute, and Toyota Motor Manufacturing Texas.

## History

Like most cities in Texas, San Antonio was served by a loop around the city long before the arrival of the Interstate Highway System. Loop 13, although not a freeway, served in this role up until the 1950s, when many of San Antonio's freeways were constructed. The northern half of Loop 13 followed the current path of I-410 while the southern half still exists on the south side of San Antonio. Much of the freeway was proposed during the mid-1950s with construction beginning on the northwest portion of the loop near I-10. On October 15, 1960, Loop 13 from I-10 to I-35 was redesignated as Loop 410 for continuity purposes. By 1961, the freeway had been completed from I-35 on the southwest side to just east of US 281 near the airport, where it continued once to the east as a four-lane highway to I-35. By 1964, the southern arc had been extended eastward from I-35 to Roosevelt Avenue and was under construction from Roosevelt Avenue to I-35 on the east side of the city. By 1967, the eastern arc had been completed to Interstate Highway standards, and the remaining portion from US 281 to I-35 on the city's north side had been completely built to Interstate Highway standards but still carried the Loop 410 designation until July 31, 1969, when it officially became I-410.
Due to the city growing primarily to the north, I-410 required widening along this stretch. It was expanded to six lanes in the late 1970s and early 1980s from Ingram Road to I-35 north. It was further expanded to six lanes from Ingram Road to Valley Hi Road in 1987. An additional westbound lane was added from I-10 west to Babcock Road in 1996.
I-410 was widened from the late 1990s through early 2010s along its entire northern arc from Culebra Road to Austin Highway, with five lanes each way and interchange reconstructions at I-10 and San Pedro Avenue, and an entire new interchange at US 281, officially called the "San Antonio Web".

## Exit list

Exit numbers correspond to mileage from the south junction with I-35. The entire route is in Bexar County.
| Location | mi | km | Exit | Destinations | Notes |
| San Antonio | 0.75 | 1.21 | 1 | Frontage Road | |
| San Antonio | 1.88 | 3.03 | 2 | FM 2536 (Old Pearsall Road) | |
| San Antonio | 3.47 | 5.58 | 3A | Ray Ellison Boulevard | Signed as exit 3 northbound |
| San Antonio | 4.23 | 6.81 | 3B | Medina Base Road | Northbound exit is via exit 3 |
| San Antonio | 4.93 | 7.93 | 4 | Valley Hi Drive – Lackland AFB | |
| San Antonio | 6.18 | 9.95 | 6 | US 90 (Cleto Rodriguez Freeway) – San Antonio, Del Rio | |
| San Antonio | 7.61 | 12.25 | 7 | Marbach Road | |
| San Antonio | 8.80 | 14.16 | 9A | SH 151 (Stotzer Freeway) – SeaWorld | Signed as exit 9 northbound |
| San Antonio | 9.51 | 15.30 | 9B | West Military Drive | Southbound exit and northbound entrance |
| San Antonio | 10.41 | 16.75 | 10 | Culebra Road | Former FM 3487 |
| San Antonio | 11.53 | 18.56 | 11 | Ingram Road | |
| San Antonio | 12.84 | 20.66 | 12 | Exchange Parkway | Southbound exit and entrance |
| San Antonio | 13.16 | 21.18 | 13A | SH 16 north / Spur 421 (Bandera Road) – Leon Valley, San Antonio | North end of SH 16 concurrency; signed as exits 13A and 13B (north) westbound; signed as exit 13 eastbound |
| San Antonio | 13.62 | 21.92 | 13B | Evers Road | Eastbound exit is via exit 13; westbound exit and eastbound entrance; westbound is via exit 14A |
| San Antonio | 14.30 | 23.01 | 14A | Summit Parkway | Westbound exit and entrance |
| San Antonio | 14.80 | 23.82 | 14B | Callaghan Road | Signed as exit 14 eastbound |
| San Antonio | 15.21 | 24.48 | 14C | Babcock Road | Eastbound exit is via exit 14, access to South Texas Medical Center |
| San Antonio | 16.08 | 25.88 | 15 | Loop 345 (Fredericksburg Road) – Balcones Heights | Access to South Texas Medical Center and Methodist Texan Hospital |
| San Antonio | 16.69 | 26.86 | 16 | I-10 / US 87 (McDermott Freeway) – San Antonio, El Paso | I-10 exit 564; 5-level stack interchange |
| San Antonio | 17.19 | 27.66 | 17A | Cherry Ridge Drive | Eastbound exit and westbound entrance, westbound exit is via exit 17 |
| San Antonio | 17.82 | 28.68 | 17B | Vance Jackson Road | Signed as exit 17 westbound |
| Castle Hills | 18.37– 18.50 | 29.56– 29.77 | 18 | Jackson-Keller Road, West Avenue | |
| Castle Hills | 18.92 | 30.45 | 19A | Honeysuckle Lane | Eastbound exit is via exit 18 |
| Castle Hills | 19.34 | 31.12 | 19B | FM 1535 (Military Highway) – Castle Hills | Signed as exit 19 eastbound |
| Castle Hills | 19.70 | 31.70 | 19 | FM 2696 (Blanco Road) | Westbound exit is via exit 20A |
| San Antonio | 20.15 | 32.43 | 20A | Spur 537 north (San Pedro Avenue) | Signed as exit 20 eastbound |
| San Antonio | 20.60 | 33.15 | 20B | McCullough Avenue | Eastbound exit is via exit 20 |
| San Antonio | 21.31 | 34.30 | 21A | US 281 (McAlister Freeway) – Johnson City, Downtown | "San Antonio Web", fully opened June 9, 2008 |
| San Antonio | 21.49– 21.96 | 34.58– 35.34 | 21 | Airport Boulevard, Wetmore Road – Int'l Airport | Signed as exit 21B eastbound |
| San Antonio | 22.27 | 35.84 | 22 | Broadway Street | No eastbound entrance |
| San Antonio | 23.02 | 37.05 | 23 | Nacogdoches Road | No westbound entrance, westbound exit is via exit 24 |
| San Antonio | 23.83 | 38.35 | 24 | Harry Wurzbach Road – Fort Sam Houston | |
| San Antonio | 24.78 | 39.88 | 25A | Starcrest Drive | Signed as exit 25 eastbound, access to Northeast Baptist Hospital |
| San Antonio | 25.49 | 41.02 | 25B | FM 2252 (Perrin-Beitel Road) | Eastbound exit is via exit 25 |
| San Antonio | 25.98 | 41.81 | 26A | Loop 368 south – Alamo Heights | Signed as exit 26 westbound |
| San Antonio | 26.50 | 42.65 | 26B | Interchange Parkway, Perrin Creek Drive | Eastbound exit and westbound entrance |
| San Antonio | 26.60 | 42.81 | 27 | I-35 north (Pan Am Expressway) – Austin | North end of I-35 concurrency; signed as exit 166 northbound; freeway assumes I-35's exit numbers |
| San Antonio | 26.70 | 42.97 | 166A | Randolph Boulevard – Windcrest | Northbound exit and westbound entrance |
| San Antonio | 27.22 | 43.81 | 165 | FM 1976 (Walzem Road) | |
| San Antonio | 28.19 | 45.37 | 164B | Eisenhauer Road | |
| San Antonio | 29.82 | 47.99 | 163 | I-35 south (Pan Am Expressway) – Downtown | South end of I-35 concurrency; southbound exit and northbound entrance |
| San Antonio | 29.07 | 46.78 | 30 | Rittiman Road, Space Center Drive | Northbound exit and entrance |
| San Antonio | 30.71 | 49.42 | 30 | Binz-Engleman Road | Southbound exit and northbound entrance |
| San Antonio | 30.77 | 49.52 | 31A | FM 78 – Kirby | Signed as exit 32 northbound |
| San Antonio | 31.35 | 50.45 | 31 | I-35 south (Pan Am Expressway) / Binz-Engleman Road – San Antonio | Northbound left exit and southbound entrance |
| San Antonio | 31.58 | 50.82 | 31B | Loop 13 (W.W. White Road) | No northbound exit |
| San Antonio | 32.35 | 52.06 | 32 | Dietrich Road | Southbound exit only |
| San Antonio | 32.79 | 52.77 | 33 | I-10 (Lopez Freeway) / US 90 / SH 130 north – Downtown San Antonio, Seguin, Texas Houston | North end of SH 130 concurrency; I-10 exit 581; cloverleaf, to be replaced by 5-level stack interchange |
| San Antonio | 33.66 | 54.17 | 34 | FM 1346 (East Houston Street) | |
| San Antonio | 35.39 | 56.95 | 35 | US 87 (Rigsby Avenue) – Victoria, La Vernia | |
| San Antonio | 37.22 | 59.90 | 37 | Southcross Boulevard/New Sulphur Springs Road, Sinclair Road | |
| San Antonio | 38.54 | 62.02 | 39 | Spur 117 (W.W. White Road) | |
| San Antonio | 40.54 | 65.24 | 41 | I-37 / US 281 north (Adams Freeway) – San Antonio, Corpus Christi | East end of US 281 concurrency; I-37 exit 133, access to Mission Trail Baptist Hospital |
| San Antonio | 41.29 | 66.45 | 42 | Spur 122 (South Presa Street) / Southton Road | |
| San Antonio | 43.21 | 69.54 | 43 | Espada Road – San Antonio Missions National Historical Park | Westbound exit is via exit 44 |
| San Antonio | 44.37 | 71.41 | 44 | US 281 south / Spur 536 (Roosevelt Avenue) – Pleasanton | West end of US 281 concurrency |
| San Antonio | 45.94 | 73.93 | 46 | Moursund Boulevard | |
| San Antonio | 47.22 | 75.99 | 47 | University Way – Texas A&M University–San Antonio | Eastbound exit and eastbound entrance |
| San Antonio | 47.69 | 76.75 | 48 | Zarzamora Street | |
| San Antonio | 48.92 | 78.73 | 49 | SH 16 south (Palo Alto Road) / Spur 422 (Poteet-Jourdanton Freeway) – Poteet | East end of SH 16 concurrency |
| San Antonio | 51.32 | 82.59 | 51 | FM 2790 (Somerset Road) | |
| San Antonio | 52.300.00 | 84.170.00 | 53 | I-35 (Pan Am Expressway) – San Antonio, Laredo | South end of SH 130 concurrency; I-35 exit 145A |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Incomplete access ||||||