Nevertheless, they do seem pretty much old, like some centuries at least , i have only seen ONE bridge here that has some centuries, like two and a half or something, it is located on a city not far away from the city where i live, that city also has a fort dating from before the independence! , they used to fight against the Aboriginals from there
I've got a separate photo of that round brick-built affair next to the 'weak bridges' sign and on it is inscribed: "Flood - Nov 1st 1823 - This Height' so I assume the bridges are at least that old.