Texas State Highway Spur 421
|Maintained by TxDOT|
|Length||6.013 mi (9.677 km)|
|South end||I-10 / US 87 in San Antonio|
|North end||I-410 / SH 16 in Leon Valley|
Spur 421 begins at an intersection with IH 10 north of Downtown San Antonio. The route follows Culebra Road to the west before turning to the northwest along Bandera Road. The designation ends at Loop 410 and SH 16; southbound SH 16 follows the Loop 410 freeway, while northbound SH 16 continues along Bandera Road.
The entire route is in Bexar County.
|San Antonio||0.0||0.0||I-10 / US 87||Southern terminus; continues as Culebra Road|
|1.5||2.4||24th Street / Wilson Boulevard|
|1.6||2.6||Bandera Road / Culebra Road west – St. Mary's University||Route continues along Bandera Road|
|2.1||3.4||Cincinnati Avenue – Woodlawn Lake|
|2.3||3.7||General McMullen Drive / Saint Cloud Road|
|Leon Valley||6.0||9.7||I-410 (Connally Loop) / SH 16 south|
|SH 16 north (Bandera Road)||Northern terminus and continuation|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Transportation Planning and Programming Division (n.d.). "State Highway Spur No. 421". Highway Designation Files. Texas Department of Transportation. Retrieved January 2, 2011.
- Transportation Planning and Programming Division (2014). Texas County Mapbook (PDF) (Map) (2014 ed.). 1:120,000. Texas Department of Transportation. p. 339. Retrieved December 4, 2014.
- Google (January 7, 2011). "Overview map of Texas State Highway Spur 421 Distances Between Interchanges" (Map). Google Maps. Google. Retrieved January 7, 2011.