The Interstate Bridge, linking Portland to Vancouver, will have intermittent closures in both directions this Friday and Saturday nights as crews grease the five miles of bridge cables.
Starting at 10 p.m. Friday Sept. 6 and again at 10 p.m. Saturday Sept. 7, the lift spans on both the northbound and southbound bridge spans carrying Interstate 5 will be raised for as long as 25 minutes with as many as 20 lifts each night. The two spans will be raised at times separately and at times simultaneously.
During the lifts, the bridge will be closed to all traffic including bicycles, pedestrians and motorized vehicles.
Greasing the cables will be the second step in a two-step process designed to preserve the bridge’s lift capacity. In August, maintenance crews applied oil, which was absorbed into and strengthened the lift cables. The second step this weekend will apply grease that will protect the outer shell of the cables.
Traffic should plan an alternate route or expect delays. As a detour, northbound traffic can use Interstate 84 east to northbound Interstate 205 across the Glenn Jackson Bridge into Washington. Southbound traffic may take SR 14 east to Interstate 205 into Oregon.
The Interstate Bridge is two separate spans. The northbound bridge opened in 1917 and the southbound bridge in 1958.