Texas State Highway 21
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| State Highway 21 |
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| Length: | 272.7[1] mi (438.9 km) | ||||||||
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| Formed: | before 1917 | ||||||||
| West end: |  SH 80 in San Marcos |
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| Major junctions: |
 US 183 |
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| East end: |  LA 6 east of San Augustine |
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State Highway 21, or SH 21, runs from the Texas-Louisiana boundary east of San Augustine to San Marcos in east and central Texas.
[edit] History
SH 21 was one of the original 26 routes proposed in Texas in 1917 along a route from St. Augustine to Gonzales. There was proposed extension southward to Karnes City by 1922, but most of it was transferred to SH 80 instead. By 1933, the terminus was shortened to Giddings. By 1943, the western terminus had been rerouted through Paige to end in San Marcos, along its current route.
[edit] Counties and junctions
| County | Junction | Notes |
|---|---|---|
| Hays | SH 80 – San Marcos |
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| Caldwell | US 183 |
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| Bastrop |  SH 71 – Bastrop |
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 SH 304 – Bastrop |
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 SH 95 – Bastrop |
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 US 290 |
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| Lee |  US 77 |
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| Burleson |  SH 36 – Caldwell |
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| Brazos |  SH OSR – west of Bryan |
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 SH 6 – Bryan |
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 US 190 – Bryan to Madisonville |
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| Madison | ||
 SH 90 – Madisonville |
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 SH 75 – Madisonville |
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 I 45 – Madisonville |
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| SH OSR – Midway |
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| Houston |  SH 7 – Crockett |
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 SH 19 – Crockett |
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 US 287 – Crockett |
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| Cherokee |  SH 294 – Alto |
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 US 69 – Alto |
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| Nacogdoches |  US 59 – Nacogdoches |
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| SH 7 – Nacogdoches |
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| San Augustine |  US 96 – San Augustine |
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 SH 147 – San Augustine |
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| Sabine |  SH 103 |
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 SH 87 – Milam |
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| LA 6 |
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