This map area occupies the eastern slopes of Mount Shasta from its base to tree line at about 8000 feet elevation. It is formed on MUDFLOW deposits, outwash slopes and LAHAR deposits. It has deep soils with frequent rock outcrops.
Typical vegetation is red fir and white fir with western white pine and whitebark pine near tree line. The understory is mainly pine mat manzanita. Open stands of Shasta red fir dominate the slopes of Mount Shasta above 5500 feet elevation. Some trees in these stands exceed 400 of age. Pinemat manzanita is the most common understory shrub. Mixed stands of white fir and red fir are found are found between 4500 and 5500 feet elevation on Mount Shasta. These stands may also contain western white pine and sugar pine. These stands usually have no understory shrub layer.
The most prominent features are Ash Creek and Mud Creek which are GLACIAL OUTWASH streams with large scenic canyons and waterfalls. Mud Creek is the largest glacial stream on Mount Shasta. It is carrying glacial debris to its floodplain below.
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