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The land bridge across the Columbia river at Cascade Locks was caused by a massive landslide from the N. side of the river. The lumpy debris field is still very evident today. The Missoula floods eroded and undermined the ground in the gorge, which eventually led to the landslide at that location.
The land bridge was not destroyed by the Missoula floods, but simply by the river filling up the impoundment, overtopping the bridge, and washing it away. Strawberry island by North Bonneville is a big eddy bar formed by the land bridge washout.
posted 2 years, 6 months ago
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