A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat.

How many drawbridges are in the US?

The U.S. has 614,387 bridges, almost four in 10 of which are 50 years or older. 56,007 — 9.1% — of the nation's bridges were structurally deficient in 2016, and on average there were 188 million trips across a structurally deficient bridge each day.

Are there any drawbridges in California?

Winn in California's Drawbridges — The Link to California's Maritime Past. ... Caltrans also owns two drawbridges in the Oakland area. The Bay Farm Island Bridge, which serves as State Route 61 connecting to the city of Alameda, was built by Caltrans in 1952 but is maintained by the Alameda County Public Works Agency.