This map area occupies the lower elevations on Mount Shasta's northern flank between 3500 and 5500 feet (1067 and 1676 meters) elevation. It is formed by MUDFLOW deposits, PYROCLASTIC flows, and DEBRIS AVALANCHES. This material originated higher on the mountain and came to rest on the gently sloping plain of this map area. These processes combined to form a complex landscape of deep, sandy, droughty soils, and cobbly outwash terraces.
Stands of Ponderosa pine with a bitterbrush understory occupy much of Mount Shasta's northern slopes. This is one of the farthest west stands of "Eastside Pine" ecological type. This community is adapted to the droughty sites in Mount Shasta's "rain shadow". Yearly precipitation is about 20 inches.
The most prominent feature is Whitney Creek. Whitney Creek is known to flood with climatically-triggered mudflows. The most recent occurred in 1997 when it covered Highway 97 with over 30,000 cubic yards (23,000 cubic meters) of mudflow debris.
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