SC 101 ALT: Appeared about 1937 as a loop renumbering of a rerouted SC 101.
In 1947, SC 101 ALT was downgraded to S-42-12. Today none of this is public road as S-42-12 has totally been changed. The E-W portion of SC 101 ALT runs over the BMW Fire Dept driveway and the N-S portion uses some of Gateway Dr.