Lake Sylvia State Park 1812 N Lake Sylvia Rd Montesano, WA 98563 Phone : (360) 249-3621 Business Category Campgrounds Parks & Playgrounds Recreational Vehicle Parks & Campsites Amusement & Recreation Washington State Of--parks & Recreation Commission, Lake Sylvia State Park Lake Sylvia Montesano, WA 98563 Phone : (360) 249-3621 Business Category Government Offices-State Government Offices State & Local Government Offices & Public Schools Washington State Of--eastern State Hospital, Children And Family Services, Child Care Licensing Centers Complaints Homes, Foster Care Licensing Lake Sylvia Montesano, WA 98563 Phone : (360) 249-3621 Business Category Government Offices-State Government Offices State & Local Government Offices & Public Schools