Mostly sport, with a few trad routes mixed in. Highlight of the area is World Wall I, with a great selection of super fun routes from 5.9 to 5.14 on a long, overhanging wall. Some routes stay dry in the rain, and the crag gets a mix of sun and shade throughout the day.
Take Exit 32 off I-90 to the Little Si trailhead. A mellow 25 minute hike takes you to the routes.
Mountain Project's determination of some of the classic, most popular, highest rated routes for Exit 32 / Little Si:
Near the middle of WW1 Aborigine takes a steep line just on the edge of a dihedral. It features a low sequency crux that leads to a few pumpy moves and a great rest. Then you shot up to the anchors with a mini crux after cliping the last bolt. If your not tired continue on fixed draws on the extension. ...[more]Browse More Classics in WA
Good climber food in the town of North Bend! Downtown has an old style bakery with good everything. Next to the Ace Hardware is a somewhat hidden place called the Reef. Good fish and chips and bottles of Snoqualmie.
Finally a good swimming hole is located at the end of 6th street (take a right off of Balarat)
The town of north bend is 5 minutes away. The area is about 40 minutes west of Seattle on I-90. The rock is volcanic, I have heard it called rhino rock. It is a little slick but surprisingly fun to climb on. Not a destination crag but certainly worth a trip if you are in the Seattle area. Most of the routes where put up in the 90's though there was climbing earlier. Some newer harder routes have gone up recently, mostly by Ben Gilkison I'm sure there are a few others, too. There are some access issues, in only that, new routes can not be established on any wall that doesn't currently have climbing. Additionally, routes are supposed to end with chain anchors and loweroffs, instead of topping out to prevent erosion.
Little Si is all plutonic igneous rock. World wall is mostly serpentine (hydrated ultramafic rocks! Cool!) which is a phylosilicate (primary, unlike secondary clays) which makes it super slippery. Serpentine is some of the most beautiful rock in the world to look at when cut and polished, so be stoked to climb on it!!
I am in town for a few days and was thinking of going to Little Si, but a friend mentioned to me that he thinks 70m ropes are necessary for most of the routes there. Is this the case? I only brought a 60m with me.