[2] It is the highest numbered route in the Arizona state highway system.

According to ADOT Spokesperson Donal Cassano, "SR 989 was turned back to Oro Valley (as of June 2012) and is no longer a state highway.

[4] The road was established as a state highway on its current routing through Oro Valley in 1991.

[2] Following its establishment, the road was not otherwise adjusted and remains today with its original routing.

The entire route is in Oro Valley, Pima County.