Boat access to this day-use-only, primitive park is regulated to protect the 2,000-acre island. The largest island in Flathead Lake, Wild Horse has been a landmark rich with history since the Salish-Kootenai Indians were reported to have used it to pasture horses to keep them from being stolen by other tribes. It preserves an endangered palouse prairie environment, incredible wildlife, and historic resources. Check with park staff on the best ways to reach the island and its trails and views. Private property is found along the perimeter of the island.