Mount Margaret is part of the rugged topography within the Cascade Range in the state of Washington surrounded by the Alpine Lakes Wilderness.[7] The history of the formation of the Cascade Mountains dates back millions of years ago to the late Eocene Epoch.[8] Geological events including tectonic reorganization and extense magmatism created the features of Mount Margaret and its surroundings with craggy peaks and ridges, deep glacial valleys, and granite walls.[9] The diverse topography and drastic elevation changes over the Cascade Range lead to various climate differences. During the Pleistocene period dating back over two million years ago, glaciation advancing and retreating repeatedly scoured and shaped the landscape.[8] With the North American Plate overriding the Pacific Plate, episodes of volcanic igneous activity occurred.[8] The last glacial retreat in the Alpine Lakes area began about 14,000 years ago and was north of the Canada–US border 10,000 years ago.[8] The U-shaped cross section of the river valleys is a result of that recent glaciation. Uplift and faulting in combination with glaciation has been the dominant processes that have created the tall peaks and deep valleys of the Alpine Lakes Wilderness area.
Climate
Mount Margaret is located within a marine west coast climate zone of western North America.[10] Most weather fronts originate in the Pacific Ocean, and travel northeast toward the Cascade Mountains. As fronts approach, they are forced upward by the peaks of the Cascade Range (Orographic lift), causing them to drop their moisture in the form of rain or snowfall onto the Cascades. As a result, the west side of the Cascades experiences high precipitation, especially during the winter months in the form of snowfall. During the winter months, weather is usually cloudy, but due to high-pressure systems over the Pacific Ocean that intensify during summer months, there is often little or no cloud cover during the summer. Because of maritime influence, snow tends to be wet and heavy, resulting in high avalanche danger.[10] The months July through September offer the most favorable weather for viewing or climbing Mt Margaret.
