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2005 Subsidence and Geologic Ftold Obsarvahons <br />Box Canyon, West Flatiron, Apache Rocks. <br />and South of Divide Mining Areas <br />Figure 4. Westward view, from left to right, of the landslide shown in Figure 3, showing 1) the head scarp <br />50 to 100 teat high (in the shadow), 2) an elongate closed depression filled with bouldors, and 3) the main <br />slump block. The vertical onentation of the pine tree in the upper right indicates that the final orientation of <br />the block remains roughly the same as Its orlenlabon belore it became detached. <br />Landslide West of the mouth of Box Canyon <br />The landslide west of the mouth of Bux Canyon initially c>leutn:d during u pentxi of high <br />preripilation in the mid 191;Os, within a few years after highway construction wax completed, <br />Then moved again at time: of high precipitation dating the 1990s (Figure 5). In contrast to the <br />landslide located cast of the mouth of Box Canyon, this landslide occurred in multiple cpisixles <br />during pencils of hich prenpitation in the miJ 1980s and mid 1990s. <br />83t-032.710 Wnght Water Engineors. Inc. Page 13 <br />Novamber2005 <br />