The larger versions you can see by clicking are much better.
At the Madison Campground, the Gibbon and Firehole Rivers join to form the Madison (which ultimately joins the Jefferson and Gallatin to form the Missouri River). This is the Madison looking downstream in its first few hundred yards, taken from behind the restroom across from my campsite on Wednesday, August 15th.
This photo is looking upstream at the Madison River, from almost within sight of my campsite. The damaged trees are dead from Yellowstone’s fires.
The water at Yellowstone is largely melted snow that filtered into the ground and is brought back up by springs and the hydrothermal activity. It is exceptional clear. The river was cool but nearby people were relaxing in small hot springs, which I did the next day.