Business Loop I-10 - Fontana and Colton

This business route began east of Interstate 15 and followed Valley Boulevard (former U.S. 70-99) through Colton between Exit 59 (Etiwanda Avenue / Valley Boulevard / Commerce Drive) and Exit 71 (Mount Vernon Avenue). This business loop was not listed in the 1991 state signing log. Despite that, at least one sign for the route remained in place along Valley Boulevard as verified by Cameron Kaiser in 2006.