Vampires will, generally speaking, do whatever it takes to minimize the risk involved in crossing running water. It won't stop them dead, but they're not going to just cross the stream either. They will be either turning into bat form to fly across, or using a footbridge to cross if there is one. They cannot cross such streams in gaseous form for any reason.
What happened with Jander Sunstar is canon, though anything else written by Golden should be carefully considered. "The Enemy Within", which describes Malken/Tristan Hiregaard, goes quite strongly against established canon for instance and should be disregarded.