Interstate 37 (
I-37) is a
Interstate Highway located within the
U.S. 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
U.S. Route 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.