(Portland, OR)  --  Multnomah County officials say they plan to have the new Sellwood Bridge open to traffic on March 1st.  The "Portland Tribune" reports the old Sellwood Bridge will be closed for four days beginning on February 25th, to allow crews to dismantle it in time for the opening of the new span.  Details are being formulated for a community celebration on the new bridge on February 27th.