Trillium Lake, with Mount Hood as an incredible backdrop, is one of the more popular day-use and camping destinations in the Mt. Hood National Forest. The roads around the lake are groomed for cross-country skiers in the winter. The lake itself is not natural: the boggy meadows here were submerged by a dam built across Mud Creek in 1960. The Trillium Lake Trail circles the lake and affords a visit, via a series of boardwalks, to its less-trafficked west shore, where a variety of wetland wildflowers can be observed in the summer.