Assertion: river's channel | /r/CapableOf | enter about 101 miles
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text: The main channel, which is 40 feet (12 m) deep and varies in width from 600 to 1,900 feet (180 to 580 m) (although the river broadens to 2,000 feet (610 m) in some of its lower reaches), enters the Columbia about 101 miles (163 km) from the larger river's mouth on the Pacific Ocean.