Texas State Highway OSR
# Texas State Highway OSR

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. It was originally designated on December 17, 1929, as Texas State Highway 938, with the SH OSR designation first being used in 1942.

"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 SH 21 just east of the Brazos River in Brazos County. It crosses U.S. Highway 190 (US 190) and SH 6 north of Bryan. Just west of this intersection, it begins to run along the county line between Brazos County and Robertson County. Upon crossing the Navasota River, OSR continues as the county line, this time between Leon County and Madison County. It passes through Normangee and crosses Interstate 45 (I-45). East of I-45, OSR crosses solely into Madison County and ends at Midway at another junction with SH 21.

## Major intersections

| County | Location | mi | km | Destinations | Notes |
| - | - | - | - | - | - |
| Brazos | ​ | 0.00 | 0.00 | SH 21 – Caldwell, Bryan | Western terminus |
| Brazos | ​ | 4.2 | 6.8 | FM 1687 (Sandy Point Road) – Bryan | |
| Brazos–Robertson county line | Benchley | 8.0 | 12.9 | US 190 / SH 6 to Spur 231 – Waco, Houston | Interchange; future I-14; access to Spur 231 via southern frontage road |
| Brazos–Robertson county line | ​ | 12.1 | 19.5 | FM 2223 south – Bryan | |
| Brazos–Robertson county line | ​ | 18.8 | 30.3 | FM 46 north – Wheelock | |
| Brazos–Robertson county line | ​ | 27.3 | 43.9 | FM 1940 north – Franklin, New Baden | |
| Navasota River | Navasota River | 29.0 | 46.7 | Bridge | Bridge |
| Madison–Leon county line | ​ | 31.1 | 50.1 | FM 1452 east | |
| Madison–Leon county line | Normangee | 37.2 | 59.9 | FM Spur 3 to FM 3 – Hilltop Lakes | |
| Madison–Leon county line | Normangee | 37.5 | 60.4 | FM 39 – Jewett, North Zulch | |
| Madison–Leon county line | ​ | 39.4 | 63.4 | FM 2289 east | |
| Madison–Leon county line | ​ | 46.3 | 74.5 | FM 2485 north | |
| Madison–Leon county line | ​ | 48.0 | 77.2 | I-45 – Centerville, Madisonville | Interchange; I-45 exit 152 |
| Madison | ​ | 50.3 | 81.0 | SH 75 – Madisonville, Leona | |
| Madison | ​ | 54.8 | 88.2 | FM 579 north | |
| Madison | ​ | 57.2 | 92.1 | FM 2346 south | |
| Madison | ​ | 58.1 | 93.5 | FM 1119 north – Centerville | |
| Madison | Midway | 62.0 | 99.8 | SH 21 – Madisonville, Crockett | Eastern terminus |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi ||||||
