Operating since April 1964, Chesapeake Bay Bridge-Tunnel functions both as a bridge and a tunnel, as its name implies. After the $200 million structure's completion, the American Society of Civil Engineers named it "one of the seven engineering wonders of the modern world."
The City of Fort Collins, Colorado recently completed the construction of a 70-feet hiking/biking tunnel, underneath Burlington Northern Santa Fe (BNSF) Railway tracks, which will ultimately connect more than 30 miles of trails.
Officials from the U.S. Department of Interior's Bureau of Reclamation have decided to implement safety works at Boca Dam in California that will meliorate its performance during potentially big earthquakes.
The 80-year-old Williamsville Bridge has been closed since October due to the fact that a civil engineer after a routine inspection decided that it is unsafe. Mayor James Young said "That bridge carries a lot of traffic."