300 to 400 Million Cubic Feet Per Second
February 21, 2026
213,282
4,205
174
2.05%
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1:02Now Playing300 to 400 Million Cubic Feet Per Second
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as posted by the channelA terminal moraine traces the exact edge of a glacier lobe that once reached back over the Canadian Rockies. Next to it lies the Grand Coulee. A canyon carved by meltwater pulses that peaked at 300 to 400 million cubic feet per second between 12,000 and 14,000 years ago. Water at that volume doesn't erode gradually, it excavates entire landscapes.
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