[agracier]

CzechTexan, yes I suppose water is not at 0 elevation...because it's a mountain landscape :???:

But how could I check that elavation and correct it ? any idea ?

I don't think you're going to be able to place a game bridge at that height.

What you can do however, mainly for visual purposes, is place a bridge object from dlv_Bridge Mod.

viewtopic.php?t=13473&highlight=bridge+mod

These objects can be placed anywhere and look like bridges. They do not however act as bridges, since i do not believe that moving vehicles will use them to drive across. They will probably just drive into the water and emerge on the other side, sort of like submersible amphibious machines ... a limitation that I do not know how to get around.

With trains the problem is somewhat worse, since they will not ride underwater at all ... so railway bridge objects are solely for visual purposes ....