They used 10 hydraulic cylinders, two per pier.
Article with photo gallery and time lapse movie:
Sellwood Bridge move comes off without a hitch, amazing hundreds of onlookers | OregonLive.com
"Traveling about six feet per hour, the bridge's 1,100-foot-long steel truss slid so slowly along specially built tracks that actual movement was nearly impossible to discern."
Article with photo gallery and time lapse movie:
Sellwood Bridge move comes off without a hitch, amazing hundreds of onlookers | OregonLive.com
"Traveling about six feet per hour, the bridge's 1,100-foot-long steel truss slid so slowly along specially built tracks that actual movement was nearly impossible to discern."