Texas State Highway OSR

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State Highway OSR

Old San Antonio Road
SH OSR; highlighted in red
Route information
Maintained by TxDOT
Length61.918 mi[1] (99.647 km)
Major junctions
West end SH 21 near Bryan
Major intersections US 190 / SH 6 in Benchley
I-45 near Cross Roads
East end SH 21 at Midway
CountryUnited States
CountiesBrazos, Robertson, Leon, Madison
Highway system
SH NASA Road 1 SH 1

State Highway OSR (SH OSR) is a state highway in the U.S. state of Texas.

The route is the section of the Old San Antonio Road in east-central Texas that is maintained by the Texas Department of Transportation. While most of the original Old San Antonio Road (that is, the section of the road that is not private property) follows State Highway 21, State Highway OSR provides a routing close to the original alignment of the road near and around the Bryan-College Station metropolitan area.[1] It was originally designated on December 17, 1929, as Texas State Highway 938, with the SH OSR designation first being used in 1942.[2][3][1]

"OSR" is the only state highway in Texas with a completely alphabetical designation and one of only two where the designation begins with a letter (Texas State Highway NASA Road 1 being the other with a beginning letter).

Route description

OSR begins at an intersection of State Highway 21 just east of the Brazos River in Brazos County. It crosses U.S. Highway 190 and State Highway 6 north of Bryan; at a point just west of this intersection, it becomes the county line between Brazos County and Robertson County.

Upon crossing the Navasota River, OSR continues as the county line, this time for Leon County and Madison County. It passes through Normangee and crosses Interstate 45. East of Interstate 45, OSR crosses solely into Madison County and ends at Midway at another junction with SH 21.

A sign for Texas State Highway OSR, located west of Normangee, Texas near Interstate 45

Major intersections

Brazos0.000.00 SH 21 – Caldwell, BryanWestern terminus
4.26.8 FM 1687 (Sandy Point Road) – Bryan
county line
US 190 / SH 6 to Spur 231 – Waco, Houston
Interchange; future I-14; access to Spur 231 via southern frontage road
FM 2223 south – Bryan
FM 46 north – Wheelock
FM 1940 north – Franklin, New Baden
Navasota River29.046.7Bridge
county line
FM 1452 east
FM 3 west – Hilltop Lakes
37.560.4 FM 39 – Jewett, North Zulch
FM 2289 east
FM 2485 north
48.077.2 I-45 – Centerville, MadisonvilleInterchange; I-45 exit 152
Madison50.381.0 SH 75 – Madisonville, Leona
FM 579 north
FM 2346 south
FM 1119 north – Centerville
Midway62.099.8 SH 21 – Madisonville, CrockettEastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b c d Transportation Planning and Programming Division (n.d.). "State Highway OSR". Highway Designation Files. Texas Department of Transportation. Retrieved October 25, 2010.
  2. ^ "Minutes" (PDF). publicdocs.txdot.gov. Texas Department of Transportation. December 16, 1929. Archived (PDF) from the original on June 18, 2018. Retrieved 28 April 2023.
  3. ^ "Minutes" (PDF). publicdocs.txdot.gov. Texas Department of Transportation. November 18, 1938. Archived (PDF) from the original on February 23, 2018. Retrieved 28 April 2023.
  4. ^ Google (January 5, 2011). "Overview map of Texas State Highway OSR Distances Between Interchanges" (Map). Google Maps. Google. Retrieved January 5, 2011.