was transferred to new SH 283. On October 27, 1989, a section from US 90A to McKeever Road (McKeever Bypass) was added.

A spur, SH 6A was designated on August 1, 1928, from SH 6 to Texas City. On March 19, 1930, this route was renumbered as SH 146.

In June 2016, a section of the highway in Eastland County between Cisco and Albany