Goat Rocks Wilderness is a U.S. wilderness area in Washington, United States, consisting of 108,096 acres (43,745 ha) of Mount Baker-Snoqualmie National Forest and Gifford Pinchot National Forest on the crest of the Cascade Range south of U.S. Highway 12. Its central feature is a number of rugged peaks, the Goat Rocks, that are named after the numerous mountain goats that live in the area. Extinct for some two million years, a volcano with an elevation of 12,000 feet (3,700 m) once dominated this landscape. The eroded remnant of this volcano consists of rugged peaks that average over 7,000 feet (2,100 m) elevation. The highest point among them is Gilbert Peak, at 8,184 feet (2,494 m) with a prominence of 3,664 feet (1,117 m). On the shaded northern slopes of the major peaks are the Packwood, McCall, Conrad, and Meade glaciers. The wilderness is drained by the North and South Forks of the Tieton, Cispus, and Cowlitz rivers and their tributaries. The lowest point in the wilderness is near Packwood Lake at 2,920 feet (890 m). The Pacific Crest Trail (PCT), stretching from Canada to Mexico, passes through the Goat Rocks. The Washington State portion of this trail was formerly known as the Washington Cascade Crest Trail completed in 1935. In 1968, it was designated as part of the PCT by the National Trail System Act. The Yakama Indian Reservation, bordering the Goat rocks Wilderness on the southeast side, is closed to the general public except for the Pacific Crest Trail route.