what year was the first bridge inven ted?

Answer 1

I don't know what year it was, but I'm pretty certain it was the Chinese who did it - hundreds of years before anyone else.

Answer 2

Injanier is correct, it would have been in prehistory and there is not way to put a date on it.
that is like asking what year people first learned to swim
or climb a tree. As long as there have been streams and rivers
people have been finding ways to cross it without getting wet.

now if you are talking about a metal bridge, you might be able to nail a date down, or a specific type of bridge. say a suspension bridge made with steel and concrete. then you could find a date for the first one. but as for just the first bridge...
there is no answer for that.

Answer 3

recent archeology in the UK has shown sites of stone age settlements being man made in lakes and other water bodies these were bridged (yes built bridges) to the shoreline .. in some cases they were only causeway-ed .. how long ago? - well even at my advanced age I can't pinpoint the date but try somewhere about 7-9000 BCE

Answer 4

Somewhere back in pre-history when Thag and Ook discovered they could drop a log across the stream and cross without having to battle the current or the crocodiles.