The picture of the Skagit River above was taken a couple of months ago, and shows the glacial blue water. Below is today's picture taken from almost the same place - the water is muddy and opaque and flowing very swiftly. The level is also much higher - there is a lack of "beach" in the shoreline across the river.

This part of the river is where the Baker River meets the Skagit river, hence the two colors of water.