The Mount Adams Wilderness is a 47,708-acre (19,307 ha) wilderness area in the U.S. state of Washington managed by the U.S. Forest Service. The wilderness encompasses an ecologically complex and geologically active landscape. Weather differs between the dry eastside and moist westside of the mountain. At 12,276 feet (3,742 m), Mount Adams is one of the major Cascade mountains. The wilderness area is on the west side of the mountain and is part of the Gifford Pinchot National Forest. The east side of the mountain is part of the Yakama Nation, with the southeast side part of the Mount Adams Recreation Area, and includes Bird Creek Meadows.