In all of my years living in the NW I've never visited Mt.Rainier NP. This wasn't the best of days with all of the cloud cover on the mountain, but it was still a beautiful experience. There were a lot of beautiful waterfalls and rivers. This one is a rusty color so I think something new is going on  with it. In all of the other pictures of it at the site, it is just a normal color, and there was nothing written explaning the change.