Fun example.

A couple of pointers for anyone planning to do that trip. 1) The Grand Canyon has two sides. If you visit the north rim instead of the south then you can shorten the trip by 120 miles. (Though if you want to see the full extent of the canyon, you need to go to the south rim.) 2) Its route through Yellowstone uses roads that close for winter.

"Hoover Dam, CO" is incorrect: it's on the Colorado river, but on the border of NV and AZ.

Also, to do all that driving and not stop at Crater Lake in Oregon, opting for the Columbia River... Sub optimal route planning, IMO!