The AAC Millennium derrick barge is owned and operated by Advanced American Constructon, Inc. (AAC) of Portland, Oregon. The Lampson 4100 Crane combines the structural integrity and versatility of the Manitowoc 4100 with the safety and ease of operation due to a complete hydraulic operating system conversion. See additonal informaton on the Lampson 4100 Millennium package at www.lampsoncrane.com