That is very questionable -- many in the Redwood Creek drainage were more likely to top any redwoods found south -- and purposefully not measured, though easily done once they were put horizontally. When companies were fighting the Nat Park expansion in the 70s, they preferred not to let the world know they were actively finding and cutting down the tallest living things in the world at the same time.
Coastal Redwoods do not mind soil compaction around their roots. Some compaction is actually helpful. Unlike most tree species, including the Sierra redwoods, coastal redwoods do not have root hairs. Root hairs significantly increase the surface area available for the absorption of water and minerals. The compacting of the soil around the hairless roots increases contact and maximizes the aborption of water. It is why as one drives along the Avenue of the Giants and other roads through the Redwood Parks, on finds redwoods doing quite well with roads going over their root systems -- which extends out 100's of feet from the trunk -- not much downwards. It is also why coastal redwoods can survive massive flooding and the depositing of feet of soil around them.
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