Welcome. The club scene out here might not be to the extent you're used to coming from the East Coast. However, we do have a good, local club - the Washington Kayak Club or "WKC" - that organizes trips, training, and puts for some efforts towards local access and conservation. Their website is
http://www.washingtonkayakclub.org/The WKC is a good resource for trips up to the class III / III+ range, with the occasional IV tossed in here and there. Those club trips are great for learning our local rivers, and they provide a good way to meet paddlers with similar interests. While the overall club trip offerings might not be overwhelming, there is a (somewhat) hidden club-related social scene that resides more through social network / email generated communication than it does through club website posted trips. Sign up for a few trips, be proactive in meeting and sharing contact info with fellow paddlers who share similar interests, and you'll likely find yourself looped into some of these weekly paddling communications.