Left Coast Lifter is a floating derrick barge or sheerleg which was built to assist in the eastern span replacement of the San Francisco–Oakland Bay Bridge.

[2] Left Coast Lifter was built for the American Bridge/Fluor joint venture (ABFJV),[3] which was the lead contractor on the self-anchored suspension eastern span replacement.

[8][9] Before the heavy deck sections for the Bay Bridge were lifted, Left Coast Lifter raised a sunken tugboat in August 2009, USS Wenonah.

[14] A consortium of companies, Tappan Zee Constructors (TZC, a joint venture of Fluor, American Bridge, Granite and Traylor Brothers), purchased the crane barge, which gave them a competitive edge in the bidding process for the construction of the Tappan Zee Bridge replacement across the Hudson River.

The massive crane was being used for heavy lifts of large bridge sections,[23] and placed the final steel girder for the new Rockland-bound (westbound) span in October 2016.

However it features various significant internal structural enhancements to bear the loads imposed at the deck level by the crane at the boom foot, the mast, and the back stays.

The shear-leg crane on Left Coast Lifter has a 328-foot (100 m) long boom, weighing 992 short tons (900 t) with a 1,873-short-ton (1,699 t) lift capacity.