Mid Valley Gastroenterology- Corvallis Welcome to Mid Valley Gastroenterology- CorvallisEnter introduction here. Visitor Information Mid Valley Gastroenterology- Corvallis3521 NW Samaritan Drive, Suite 101Corvallis, OR 97330-4744Directions Phone: 541-768-6119 Fax: 541-768-6120 Static map data from ©Google