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Why does the Tanana River become shallow by late summer?
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Yukon River
Five Finger Rapid on the upper Yukon River in Yukon.
The Tanana River becomes a shallow stream by late summer because its flow is dependent on seasonal runoff from snow and glaciers in the Alaska Range. While these sources cause the river's flow to peak in July, the water levels recede significantly once this peak runoff period has passed.12