Final answer:
The state that contains the Colorado River, Yampa River, and the other rivers mentioned is Colorado.
Step-by-step explanation:
The state that contains the Colorado River, Rio Grande, Arkansas River, Yampa River, and South Platte River is Colorado. The Colorado River is a major river system in the Southwestern United States and northern Mexico, passing through Colorado, along with six other states. Known for landmarks like the Hoover Dam and the Grand Canyon, the Colorado River is one of the most regulated rivers in the United States. The Yampa River is a tributary of the Green River, which is a major tributary of the Colorado River, and it also flows entirely within Colorado.