(Portland, OR) -- The I-5 Interstate Bridge is closing overnights this week for maintenance. Only one direction of I-5 will close at a time. Tonight, I-5 southbound will close from 10 p.m. through 4 a.m. On Wednesday and Thursday, I-5 northbound will close from 11 p.m. to 5 a.m. Drivers will need to use I-205 to cross the Columbia River.