If you commute to Portland you may experience your own little “Carmageddon”like Los Angeles; but on a much smaller scale. Paving work will close the top deck of the Fremont Bridge for four weekends this summer, starting with a partial closure this coming weekend. The two left southbound lanes will be closed From 11:00 p.m. July 22nd, through 5:00 a.m., Monday July 25th. Full closures of the upper deck will follow the weekends of July 29th, August fifth and August 19th.