Lewis Clark Valley Chamber of Commerce Share: Community OrganizationsAdvertisingNon-profit Lewis Clark Valley Chamber of Commerce Visit Website 2330 Deer Pointe Drive Clarkston, WA 99403 (509) 758-7712 Facebook Twitter Hours: 9:00 am to 5:00 pm, Monday through Friday, closed for lunch 12-1 pm. About About The Mission of the Lewis Clark Valley Chamber of Commerce is to Serve, Lead and be the Voice of our members.