Comment by chowells

10 hours ago

A lot of the Cascade range is basalt, and you don't need to cut down very far to expose it. A result is that most waterways in Oregon have revealed a lot of basalt around them, at least in the mountains.

It's rare to have basements where I live in Bend, because it's all lava rock right under our feet, which is really expensive to remove.

Climbing on columnar basalt is interesting. Vantage / Frenchmans Coulee (2 hours or so east of Seattle) has a bit of a bad reputation but some of the routes are decent.