The state spent $668 million on 372 highway and bridge projects in 2012, officials of the state Department of Transportation and Development said Wednesday.

The list includes the completion of the $406 million John James Audubon Bridge that connects New Roads and St. Francisville; additional lanes in each direction on Interstate 12 between O’Neal Lane and Juban Road at a cost of $146 million; and one of the final projects in the $936 million expansion of U.S. 165 between Lake Charles and the Arkansas state line.

The new bridge and the U.S. 165 work were financed with a ballot measure called TIMED that voters approved in 1989.

Last year’s work involved more than 1,000 miles of state roads and 71 bridges.

The state has a $12.1 billion backlog of road and bridge projects.