The section west of I-84 was added to OR 7.

The section west to US 213 was completed by 1939.

However, the section west of I-29 was the most heavily damaged and it remained closed.

The section west of Yetholme is generally the same alignment as that used to this day.

In 1954, the entire section west of Golden was cut off.

The section west of Cocoa was built in the 1950s.

Officials said that section was no longer necessary because workers had completed a parallel section west of the village, along the Green Line.

The section west of the Inner Loop was mostly built during the 1960s and completed in the early 1970s.

With the exception of a small section west of Bowling, the line is still open.

Sections have opened regularly since 1996, when the first section west of Interstate 35 was opened.