It is a testament to the US National Parks Service that in 1988, 876,000 acres of the park were set aside as a formal wilderness – this represents some 95 percent of the park land that is in pristine condition. Because of the large proportion of wilderness much of its interior is accessible only by trail though there are a few spur roads that lead to various destinations around the park and scenic drives to Hurricane Ridge, along the Pacific Coast and through the heavily forested valleys of the Sol Duc, Hoh and Quinault Rivers provide glimpses of Olympic's unspoiled nature.