(Portland, OR)  --  The top deck of the 108-year-old Steel Bridge in Portland closes Sunday through the month of August for TriMet's most extensive light rail improvements in 34 years.  It'll increase reliability, but it also means re-routing all vehicle traffic, five bus lines, and disrupt MAX trains system-wide.  Shuttle buses will run every five to seven minutes carrying MAX passengers across the river between Old Town/Chinatown and the Rose Quarter.  Passengers should allow an extra 30 to 45 minutes for delays.  The 17-million-dollar project is expected to create 450 jobs.