This one is really strange. I'm trying to make a river come down from Upper Mahoney Lake to Lower Mahoney Lake. It is real, and has waterfalls. This is the site for the Mahoney Lake Hydro plant that is proposed. But no matter what i do, i cannot make that river "stick" to the terrain. It either digs a canyon if you start from the bottom, or builds a bridge if you start at the top. I redownloaded IS3, reloaded it, tried it again, same problem. went back to Thayer Creek where I had to put in a stream (same thing) and it followed the terrain perfectly. I'm guessing the problem is not IS3 ... there is something screwy about the terrain setup at Mahoney Lake. I have no idea what it could be.
Doug