Final demolition is being done on two old bridges linking Charleston and Mount Pleasant. The Pearman and Grace bridges are being demolished now that the eight-lane Arthur Ravenel bridge is open to traffic.

The $632 million Ravenel bridge on US Highway 17 opened in July of 2005. It's the most expensive bridge ever built in the state.

Workers are to use explosives to demolish one of the last large piers from the Grace next to the Cooper River shipping channel Friday.

Crews have used explosives to bring down sections of the steel superstructures of the two old bridges in recent months.

Two sections close to a marina and a State Ports Authority terminal will be cut apart using torches.

Removal of the debris from the water should be finished by March.