Mount Lago, an 8,745-foot peak in Washington’s North Cascades, is the highest summit in the Okanogan Range and a prominent feature of the Pasayten Wilderness. Its name preserves the memory of Forest Service surveyor Lage Wernstedt, born in 1878, whose work and first ascents helped map the rugged region; “Lago” reflects an American pronunciation of his first name and was also the name of his son. The mountain rises in a landscape of craggy peaks, granite spires, and deep glacial valleys shaped by terranes, volcanic activity, uplift, faulting, and repeated Pleistocene glaciation. Its runoff feeds tributaries of both the Pasayten and Methow rivers.