How does the Yukon River valley change downstream from Dawson?

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Yukon River Five Finger Rapid on the upper Yukon River in Yukon.

Downstream from Dawson, the Yukon River valley undergoes a distinct transformation. The valley narrows, and the surrounding low plateau is interrupted by mountains that reach elevations exceeding 4,000 feet (1,200 metres) approximately 15 miles (25 km) north of the river.1

As the river continues its course toward the border of Alaska, it maintains an elevation of about 1,000 feet (300 metres) above sea level.1