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Well if you search on the computer for Isambard Kingdom Brunel and find the severn bridge it should tell you.
The Golden Gate Bridge has only been closed three times because of bad weather.
It has been closed zero times.
Since Roman times
The Dauphin Island Bridge has not been destroyed. It has undergone repairs and maintenance over the years but has not been completely destroyed.
London Bridge is the oldest, a bridge has been on or near the present site since Roman times. The actual bridge of course has been replaced a number of times the last in 1973. Others have included two Roman bridges, a Saxon Bridge, a Norman bridge, a medieval bridge and a 19th century bridge before the present one. The current London Bridge is often confused with Tower Bridge by tourists.
The Old Bailey Bridge in Lynn Haven Florida. There has since been a new bridge build, but the old one still stands beside it and is closed to traffic and part of the Lynn Haven Park.
nine times
Mud, but I've never been upstream.
The present London Bridge opened in 1973 and Queen Elizabeth II was on the British Throne at the time. However, there has been a bridge on the same site since Roman times which has been replaced at various times over the centuries. The previous bridge to the present one was built in 1820 and is now at Lake Havasu City in Arizona.
Wooden bridges have been used since before recorded history. A simple log over a stream is a wooden bridge.
It will be because you haven't completed enough missions yet. After the mission 'blow your cover' has been completed(about 30 missions in)all bridges leading to algonquin(including broker bridge) will open up.