Tri-State Memorial Hospital, Inc. Share: Medical and Dental Tri-State Memorial Hospital, Inc. Visit Website 1221 Highland Avenue Clarkston, WA 99403 (509) 758-5511 (509) 758-3566 (fax) About About We place the needs of our patients and families as our top priority, along with facilitating health, healing and well being. We take pride in providing advanced rural healthcare.