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State Highway 123
State Highway 123
	SH 123; mainline in red, business routes in blue
Route information
	Maintained by TxDOT
Length	71.2 mi (114.6 km)
Existed	by 1933–present
Major junctions
South end	; US 181 / Bus. US 181 / SH 80 in Karnes City
	US 87 in Stockdale; US 90 in Seguin; I-10 in Seguin;
North end	I-35 / Loop 82 in San Marcos
Location
Country	United States
State	Texas
Counties	Karnes, Wilson, Guadalupe, and Hays
Highway system
	Highways in Texas; Interstate; US; State; Toll; Loops; Spurs; FM/RM; Park; Rec;

State Highway 123 (SH 123) is a north–south state highway in Texas, United States, that connects U.S Route 181 (US 181) in Karnes City with Interstate 35 (I-35) in San Marcos. The route was initially proposed in 1927 and has had minimal changes to its routing since then.

Route description

SH 123 begins at an intersection with US 181 just south of Karnes City and proceeds northward along the town's eastern edge. The route intersects the Business Route of US 181 and Texas State Highway 80 as it passes through town. The road continues north through farmlands before reaching an intersection with US Route 87 in Stockdale. The route continues north through ranchlands until Seguin. Reaching Seguin, Texas State Highway 46 begins, peeling off to the northwest toward New Braunfels. SH 123 continues around the eastern edge of Seguin, where it is known locally as "the Bypass", and there it intersects US 90 Alternate, US 90, and Interstate 10. The highway continues north, reaching its northern terminus at Interstate 35 in San Marcos.

History

The route was initially proposed on April 12, 1927 from Stockdale to San Marcos with a proposed extension south to Karnes City.^[2] On September 21, 1931, it was rerouted to end in Floresville.^[3] On August 4, 1932, it was restored to Karnes City, and the old route was renumbered as SH 168.^[4] On November 6, 1934, it was rerouted to Yorktown.^[5] On February 16, 1935, its south end was changed back to Karnes City.^[6] On November 18, 1938, SH 123 Loop was designated in Karnes City.^[7] On September 26, 1939, SH 123 Loop was renumbered as Loop 17. Paving was completed in the mid-1940s.

Major intersections

County	Location	mi	km	Destinations	Notes
Karnes		0.0	0.0	US 181 / Bus. US 181 end / SH 80 end – Kenedy, Corpus Christi, San Antonio	Southern terminus: southern end of US 181 Bus. / SH 80 concurrency
	Karnes City	1.4	2.3	Bus. US 181 north	Northern end of US 181 Bus. concurrency
	Karnes City	1.9	3.1	SH 80 north – Helena, Gillett	Northern end of SH 80 concurrency
		2.5	4.0	Bus. SH 123 south – Karnes City
		6.3	10.1	FM 81 east – Panna Maria	Southern end of FM 81 concurrency
		6.5	10.5	FM 81 west – Hobson	Northern end of FM 81 concurrency
	Pawelekville	13.4	21.6	FM 887 – Falls City, Gillett
Wilson		17.4	28.0	FM 541 west – Kosciusko, Poth
		20.9	33.6	FM 1347 – Kosciusko, Denhawken
		23.9	38.5	FM 537 west – Floresville
	Stockdale	25.4– 25.5	40.9– 41.0	US 87 / SH 97 to SH 119 – Floresville, San Antonio, Nixon	interchange
	Stockdale	26.3	42.3	Bus. US 87 (Main Street) – Stockdale Business District, Pandora, Nixon
		28.6	46.0	FM 3335 east to FM 1107
		35.9	57.8	FM 1681 east – Nixon
Guadalupe		45.6	73.4	FM 477 east
	Seguin	46.4	74.7	SH 46 north / Bus. SH 123 north – Seguin, New Braunfels
		49.3	79.3	FM 466 (Eastwood Drive) to SH 80 – Seguin
		49.7	80.0	US 90 Alt. (Court Street) – Seguin, Gonzales, Texas Lutheran University, Sebastopol Historical Park
		50.9	81.9	US 90 – Seguin, Luling
		51.9– 52.0	83.5– 83.7	I-10 – San Antonio, Houston	I-10 exit 610
		53.5	86.1	Bus. SH 123 south – Seguin
		53.7	86.4	FM 20 east – Fentress
	Geronimo	57.3	92.2	FM 2623 east – Fentress
		59.4	95.6	FM 758 west – Barbarosa, New Braunfels Municipal Airport, Central Texas Technology Center
		60.4	97.2	FM 1339 east – Staples
	Zorn	62.2	100.1	FM 1101 west – New Braunfels
		64.5	103.8	FM 1979 east – Martindale
		66.1	106.4	FM 1978 east – Redwood
Hays	San Marcos	68.5– 68.6	110.2– 110.4	FM 110 west
		69.6	112.0	RM 12 north (Wonderworld Drive)
		70.9	114.1	FM 621 east – Staples State Fish Hatchery
		71.1– 71.2	114.4– 114.6	I-35 / Loop 82 – San Antonio, Austin	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus

Business routes

The route has two business segments: Business 123-B (largely on Austin Street) through historic downtown Seguin and Business 123-D in Karnes City.

References

^ ^a ^b Transportation Planning and Programming Division (n.d.). "State Highway No. 123". Highway Designation Files. Texas Department of Transportation. Retrieved 2010-06-15.
^ "Minutes" (PDF). publicdocs.txdot.gov. Texas Department of Transportation. April 11, 1927. Archived (PDF) from the original on January 22, 2018. Retrieved 4 May 2023.
^ "Minutes" (PDF). publicdocs.txdot.gov. Texas Department of Transportation. September 21, 1931. Archived (PDF) from the original on January 29, 2018. Retrieved 4 May 2023.
^ "Minutes" (PDF). publicdocs.txdot.gov. Texas Department of Transportation. August 2, 1932. Archived (PDF) from the original on January 29, 2018. Retrieved 4 May 2023.
^ "Minutes" (PDF). publicdocs.txdot.gov. Texas Department of Transportation. November 26, 1934. Archived (PDF) from the original on February 6, 2018. Retrieved 4 May 2023.
^ "Minutes" (PDF). publicdocs.txdot.gov. Texas Department of Transportation. February 11, 1935. Archived (PDF) from the original on February 6, 2018. Retrieved 4 May 2023.
^ "Minutes" (PDF). publicdocs.txdot.gov. Texas Department of Transportation. November 18, 1938. Archived (PDF) from the original on February 23, 2018. Retrieved 4 May 2023.