 State Highway OSR | ||||
|---|---|---|---|---|
| Old San Antonio Road | ||||
 SH OSR; highlighted in red | ||||
| Route information | ||||
| Maintained byTxDOT | ||||
| Length | 61.918 mi[1] (99.647 km) | |||
| Existed | 1942[1]–present | |||
| Major junctions | ||||
| West end |  SH 21 west ofBryan | |||
| Major intersections | ||||
| East end | SH 21 atMidway | |||
| Location | ||||
| Country | United States | |||
| State | Texas | |||
| Counties | Brazos,Robertson,Leon,Madison | |||
| Highway system | ||||
| ||||
State Highway OSR (SH OSR) is a 61.918-mile (99.647 km) non-numberedstate highway in southeasternTexas, United States, that forms a northern loop off ofTexas State Highway 21 (SH 21).
The route is the section of theOld San Antonio Road in east-centralTexas that is maintained by theTexas 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 SH 21, SH OSR provides a routing close to the original alignment of the road near and around theBryan-College Station metropolitan area.[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).
OSR begins at an intersection of SH 21 just east of theBrazos River inBrazos County. It crossesU.S. Route 190 (US 190) /Texas State Highway 6 north ofBryan. Just west of this intersection, it begins to run along the county line between Brazos County andRobertson County. Upon crossing theNavasota River, SH OSR continues as the county line, this time betweenLeon County andMadison County. It passes throughNormangee and crossesInterstate 45 (I-45). East of I-45, SH OSR crosses solely into Madison County and ends atMidway at another junction with SH 21.
SH OSR was originally designated on September 17, 1929, asTexas State Highway 938,[2][3] to run from Midway to SH 6 (now also US 190) inBenchley, and a second section was designated from SH 21 northeast of Giddings to SH 29 (now US 183) north of Lockhart. On July 15, 1935, the section from SH 44 (now US 77) in Lincoln to SH 21 became part of SH 21. On April 19, 1938, the section from Lincoln to Bastrop also became part of SH 21. On March 26, 1942, a section from US 81 (now I-35) in San Marcos east 4.4 miles (7.1 km) was added (creating a gap), and the designation was changed to SH OSR. On April 28, 1942, the road was extended from Benchley to SH 21 near the Brazos River. On August 2, 1943, the section from SH 29 to 4.4 miles (7.1 km) east of San Marcos was added, closing the gap. Later that day, the section from Bastrop to San Marcos became part of SH 21.[1]
| County | Location | mi[4] | km | Destinations | Notes |
|---|---|---|---|---|---|
| Brazos | | 0.00 | 0.00 | SH 21 –Caldwell,Bryan | Western terminus |
| | 4.2 | 6.8 |  FM 1687 (Sandy Point Road) –Bryan | ||
| Brazos–Robertson county line | Benchley | 8.0 | 12.9 |     US 190 /SH 6 toSpur 231 –Waco,Houston | Interchange; futureI-14; access to Spur 231 via southern frontage road |
| | 12.1 | 19.5 |   FM 2223 south –Bryan | ||
| | 18.8 | 30.3 |   FM 46 north –Wheelock | ||
| | 27.3 | 43.9 |  FM 1940 north –Franklin,New Baden | ||
| Navasota River | 29.0 | 46.7 | Bridge | ||
| Madison–Leon county line | | 31.1 | 50.1 |   FM 1452 east | |
| Normangee | 37.2 | 59.9 |   FM Spur 3 toFM 3 –Hilltop Lakes | ||
| 37.5 | 60.4 |  FM 39 –Jewett,North Zulch | |||
| | 39.4 | 63.4 |  FM 2289 east | ||
| | 46.3 | 74.5 |  FM 2485 north | ||
| | 48.0 | 77.2 |  I-45 –Centerville,Madisonville | Interchange; I-45 exit 152 | |
| Madison | | 50.3 | 81.0 |  SH 75 –Madisonville,Leona | |
| | 54.8 | 88.2 |  FM 579 north | ||
| | 57.2 | 92.1 |  FM 2346 south | ||
| | 58.1 | 93.5 |  FM 1119 north –Centerville | ||
| Midway | 62.0 | 99.8 | SH 21 –Madisonville,Crockett | Eastern terminus | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | |||||
Media related toTexas State Highway OSR at Wikimedia Commons
