(Portland, OR) -- The northbound span of the Interstate Bridge is set to close tomorrow night for its regular inspection. I-5 northbound traffic should use I-84 and I-205 as a detour. A team will inspect the bridge's steel structure. The inspection is conducted every two years. The bridge will be closed from 11 p.m. Saturday through 7 a.m. on Sunday. The Jantzen Beach on-ramp to I-5 northbound will also be closed. The northbound sidewalk will be closed, but the sidewalk on the southbound span will remain open.