Texas State Highway Spur 421

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State Highway Spur 421 marker

State Highway Spur 421
Route information
Maintained by TxDOT
Length6.013 mi[1] (9.677 km)
Major junctions
South end I-10 / US 87 in San Antonio
North end I-410 / SH 16 in Leon Valley
Highway system
Loop 420Spur 422

State Highway Spur 421 (Spur 421) is a state highway spur in the San Antonio, Texas, USA metropolitan area.[1]

Route description[edit]

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.[1][2]


Spur 421 is a former route of SH 16, and was designated (along with Spur 422) on November 16, 1965, after SH 16 was rerouted around the west side of San Antonio along the Loop 410 freeway.[1]

Major intersections[edit]

The entire route is in Bexar County.

San Antonio0.00.0 I-10 / US 87Southern terminus; continues as Culebra Road
0.60.97Zarzamora Street
1.52.424th Street / Wilson Boulevard
1.62.6Bandera Road / Culebra Road west – St. Mary's UniversityRoute continues along Bandera Road
2.13.4Cincinnati Avenue – Woodlawn Lake
2.33.7General McMullen Drive / Saint Cloud Road
2.64.2Woodlawn Avenue
3.96.3Hillcrest Drive
4.87.7Evers Road
5.28.4Callaghan Road
Leon Valley6.09.7 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

See also[edit]


  1. ^ a b c d Transportation Planning and Programming Division (n.d.). "State Highway Spur No. 421". Highway Designation Files. Texas Department of Transportation. Retrieved January 2, 2011.
  2. ^ 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.
  3. ^ Google (January 7, 2011). "Overview map of Texas State Highway Spur 421 Distances Between Interchanges" (Map). Google Maps. Google. Retrieved January 7, 2011.