Business Loop I-5 - Red Bluff

SR 36 at Business Loop I-5/Historic U.S. 99 in Red Bluff, CA — Westbound SR 36 (Antelope Boulevard) at Business Loop I-5 (Main Street) and Tehama County Route A-8 in Downtown Red Bluff after crossing the Sacramento River bridge. An advance sign references historic U.S. 99. Signs for Historic U.S. 99 are quite common along the business loops for I-5 in Northern California, especially in places like Red Bluff and Dunsmuir. 05/24/08

SR 36 west at the overlap with Business Loop I-5 north in Red Bluff, CA — Westbound SR 36 (Antelope Boulevard) combines with Business Loop I-5 (Main Street) from Downtown Red Bluff to Beegum Road, 1.6 miles to the north. 05/24/08

The California State Highway System Signing Log (October, 1991) indicates that Business Loop I-5 in Red Bluff follows Main Street. The route is interchangeably signed as both the business route and historic U.S. 99.

The 4.2 mile long route of Business Loop I-5 runs along old U.S. 99 to Downtown Red Bluff and northward along the Union pacific (old Southern Pacific Railroad) line. The historical alignment disappears ahead of the business route separation with SR 36 west.

Updated August 4, 2026