 The original Loop 410 was designated on October 5, 1960, replacing part of Loop 13 from I-410 and I-10 (which replaced the portion of Loop 13 from I-10 to US 90 as this portion of Loop 13 was upgraded to Interstate standards) to I-35.On July 31, 1969, Loop 410 was redesignated as an extension of I-410 as Loop 410 was upgraded to Interstate standards already and so that I-410 could become a full loop.Business State Highway 146-E is a business loop that runs from SH 146 through Baytown to SH 146.