Interstate 37

Interstate 37
Interstate 37
	I-37 highlighted in red
Route information
	Maintained by TxDOT
Length	143.00 mi (230.14 km)
Existed	October 16, 1959–present
NHS	Entire route
Major junctions
South end	US 181 / SH 35 at Corpus Christi
	I-69E / US 77 in Corpus Christi; ; ; Future I-69W / Future I-69C / US 59 / US 281 near George West; US 181 in San Antonio; I-410 / US 281 in San Antonio; I-10 / US 87 / US 90 in San Antonio;
North end	I-35 / US 281 in San Antonio
Location
Country	United States
State	Texas
Counties	Nueces, San Patricio, Live Oak, Atascosa, Bexar
Highway system
	Interstate Highway System; Main; Auxiliary; Suffixed; Business; Future; Highways in Texas; Interstate; US; State; Toll; Loops; Spurs; FM/RM; Park; Rec;

Interstate 37 (I-37^[a]) is a 143-mile (230 km) Interstate Highway located within the southern portion of the US state of Texas. The highway was first designated in 1959 as a route between Corpus Christi and San Antonio. Construction in the urban areas of Corpus Christi and San Antonio began in the 1960s, and the segments of the Interstate Highway in rural areas were completed by the 1980s. Prior to I-37, the route between Corpus Christi and San Antonio was served by a combination of State Highway 9 (SH 9) from Corpus Christi to Three Rivers and US Highway 281 (US 281) from Three Rivers to San Antonio. As a result of the construction of I-37, SH 9 was removed from the State Highway System (the designation would be reinstated to another highway in 2014).

The highway begins in Corpus Christi at US 181 and SH 35 and heads north to San Antonio, where it ends at I-35. Beyond I-35, the freeway continues as US 281 to northern San Antonio as a major freeway. In Corpus Christi, the highway provides access to the downtown area, the Port of Corpus Christi, and Corpus Christi International Airport. In San Antonio, it provides access to Downtown San Antonio, Brooks City-Base, the Alamodome, the Tower of the Americas, the San Antonio River Walk, the Alamo, and, by extension via US 281, San Antonio International Airport. The route provides an important connection between I-35 and the Texas Gulf Coast as well as one of the few limited-access hurricane evacuation routes away from the southern Texas coast.

^ Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved November 20, 2023.
^ Transportation Planning and Programming Division (n.d.). "Interstate Highway No. 37". Highway Designation Files. Texas Department of Transportation. Retrieved February 27, 2008.
^ Transportation Planning and Programming Division (n.d.). "Highway Designations Glossary". Texas Department of Transportation. Retrieved May 20, 2020.

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[I-37_length-1] Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved November 20, 2023.

[TxDOT-2] Transportation Planning and Programming Division (n.d.). "Interstate Highway No. 37". Highway Designation Files. Texas Department of Transportation. Retrieved February 27, 2008.

[3] Transportation Planning and Programming Division (n.d.). "Highway Designations Glossary". Texas Department of Transportation. Retrieved May 20, 2020.

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