http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2524489-realistic-terrain-generation-rtg-realistic-biomes?comment=3097

No way. That doesn't even look remotely like a leftover river (which creates a strip of inappropriate surfacing). There's just some water where the river would have been, which happens sometimes, duh.

No way. That doesn't even look remotely like a leftover river

Yes, it would look like the image below. The only time I ever saw vanilla rivers not getting removed is when I broke the event that removed them. ;)