[1FreeAmerican]

Pretty sure none of that heads south to the Colorado. Most heads to the Pacific via the Snake to the Columbia. Eastern parts head into the Missouri and to the Gulf.

[j.havenfarm]

I thought of that, too. Best I can make out, a bit father west and it could have hit the headwaters if the Colorado. The Yellowstone is a tributary of the Missouri so the flood waters are flowing the wrong way, from our point of view