Business Loop I-90 - Osburn

What was originally Business Loop I-90 connecting Osburn with Silverton was split into separate state-maintained Business Spurs by 2013. The Osburn Business Spur travels 1.52 miles from Exit 57 south along Third Street to Mullan Avenue (former U.S. 10). Business Spur I-90 follows Mullan Avenue east to Silver Valley Road, concluding at the Osburn city line (ITD, 2026). The loop used to continue beyond this point on Silver Valley Road into unincorporated Silverton. It may remain signed as a full loop despite the middle portion no longer being maintained by the state.