How can I make the bridge in the air like this? When I try to do this in world editor the bridge always just sinks in the water.
http://s7.directupload.net/images/140214/ziyq248j.png
http://s7.directupload.net/images/140214/ziyq248j.png
With the bridge model selected hold ctrl and press page up until you get it where you want it. This works for all doodads.
Don't go to high, I recommend raising nearby lands or link one or more bridge with at least 1 connected to both sides.
My guess is that the bridge is way too far out of land, so there is still a bit of unpathable area between the cliff and the bridge.