SR 989 begins at a diamond interchange with the Homestead Extension of Florida's Turnpike (HEFT), on the southern edge of Princeton,[2] and proceeds north, maintaining this orientation for its entire course.

Starting amongst farmland (as of March 2011),[3] SR 989 only travels one block north before reaching suburbia, and remains within residential neighbourhoods for most of its subsequent journey.

It then turns into a two-laned farm access road and continues south to the Homestead Air Reserve Base, terminating near its northeastern corner.

[7] By the late 1960s, the State Road was realigned to Moody Drive to provide increased access to the base's two northern entrance gates as the increasing intensity of the Cold War and the rise to power of Fidel Castro in nearby Cuba amplified the importance of Homestead Air Force Base to the national security of the United States.

At some point between the realignment and the mid-1970s the road was redesignated SR 989 (the old number was subsequently applied to West Dixie Highway in North Miami in 1983).