Lewis Clark Valley Chamber of Commerce Share: Community Organizations Lewis Clark Valley Chamber of Commerce Visit Website 825 6th Street Clarkston, WA 99403 509-758-7712 (800) 473-3543 Facebook Twitter Hours: 9:00 am to 5:00 pm, Monday through Friday About About The Mission of the Lewis Clark Valley Chamber of Commerce is to Serve, Lead and be the Voice of our members.
