[Answer] What is the deepest gorge in North America?

Step 1 : Introduction to the question "What is the deepest gorge in North America?"

...Dive into the depths of hell at Hells Canyon. The aptly named canyon in Oregon is the deepest river gorge in North America. The Snake River slithers through the canyon, which spans 10 miles wide and dives 8,000 feet below He Devil Peak in the Seven Devils Mountains of Idaho and upwards of a mile below the west rim of Oregon. When you visit, be sure to check out Hells Canyon Dam and take a snapshot of the scenic canyon at the viewpoint of Hat Point Road.

[Ans] In which state is the deepest river gorge on the North American continent found?

Step 1 : Introduction to the question "In which state is the deepest river gorge on the North American continent found?"

...Where is the deepest canyon on earth? The Yarlung Tsangpo Grand Canyon (or Tsangpo Canyon), along the Yarlung Tsangpo River in Tibet, is regarded by some as the deepest canyon in the world at 5,500 m (18,000 ft). It is slightly longer than the Grand Canyon in the United States. 

 How deep is the Snake River in Idaho? The lower Snake River, from Weiser to the mouth, flows through a gorge 1 mile (1.6 km) or more deep known as Hells Canyon, the deepest river gorge in North America. The Salmon River, its largest tributary, joins the Snake near the downstream end of the canyon section.