In Dutch garden historical circles the so-called triple bridges (driepuntsbruggen) have long been considered typical of 19th century landscape design. In fact, the use of this kind of bridge seemed to have been limited to only one landscape architect, Lucas Pieters Roodbaard (1782-1851), who predominantly worked in the northern provinces of our small country.
Since 2013, TuinTerTijd has started a search for more examples of this type of bridge (see her original, first post here, including instructive drawings by some Scotsmen). That search turned out to be succesful (no real surprise there, but still: it had to be done) and lead to bridges of earlier creation and more southern (foreign) descent. And to other architects than Roodbaard, of course. In fact, the first triple bridges in France were drawn and published when Roodbaard was only two years old. And there is no doubt in my mind we will find more, and older ones in the near future.