

Until July 1991 - with construction of the roadway Involved major freeway improvements between Steck Avenue and US 183, Stack interchange at US 183 is constructed. Until October 2006 - with construction of the SH 45 North/ Until November 1990 - with construction of the roadway Until October 1989 - with construction of the freeway extension to US 290. Until July 1989 - with construction of the freeway extension to FM 734. This table contains the dates of the construction of segments of the road. On October 24, 1985, the designation was extended southward from US 290 to SH 45. The current Loop 1 was designated on October 27, 1967, from US 290 northward to Farm to Market Road 1325 (FM 1325). Thus, the highway was eventually given the nickname "MoPac" for its proximity to the railroad. In 1944, the City of Austin Planning Commission (CMAC) proposed that the highway be built in parts of the under-utilized right of way owned by the MoPac Railroad. The first mention of Loop 1 in public record was in 1929. See also: List of state highway spurs in Texas (1–99) § Spur 1 Route designation To the north, the tracks run along the east side of newer sections of the highway from Northland Drive to Braker Lane. The original section of the highway was built in the 1970s along the right-of-way of the Missouri Pacific Railroad (now owned by Union Pacific), with the railroad tracks running in the highway median between West 8th Street and Northland Drive. Local residents almost always use the name "MoPac" rather than calling the road by its number, which can cause much confusion, for few signs along the road use this name. It is named Mopac Expressway (or, according to some highway signs, Mopac Boulevard) after the Missouri Pacific Railroad (or "MoPac").


Loop 1 is a freeway which provides access to the west side of Austin in the U.S.
