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2004 Geologic Hazard Field Observations <br />South of Divide Mining Area <br />• <br />~j. ~. ''. ~ fir <br />'~ ~ v <br />.. ~~ e,' <br />. l' ~~~, t!J~.k~o ~ 11 <br />Figure 5. Vertical aerial view of approximately the same area as shown In Figure 4 (2004 West EIk Color <br />. Aerial Photo Number 23). This Image documents the changes that have occurred in the Minnesota <br />Reservoir area over the Last 41 years. The most significant changes are: (1) renewed landslide activity <br />west of the reservoir has impacted the Dry Fork road, (2) the debris 11ow/mudtlow tongue has now moved <br />closer to the mouth of Pond Gulch (north-trending drainage at west edge of photo), (3) the landslideldebris <br />flow rwrthward across Dry Fork shows renewed acbwty, and (4) the shear zone end edJacent slide to the <br />oast, which is located south of lho dam is less active than a was m 1963. <br />When mapped on the South of Divide mining area map, the slide on the south of the reservoir <br />extends approximately 3,300 feet west, 3,300 feet cast, and 3,400 feet south of the dam <br />spilAcay([.ocation 1, Map 1). <br />The higher altitude, black and white vertical aerial image of the Minnesota Reservoir area <br />show the following features (Figure 4): <br />1. A large landslide on the south side of \Mnnesota Reservoir-the area bounded by scarp <br />azeu south of the reservoir from the sharp bend in the Dry Fork road west of the dam to <br />the mouth of Deer Creek- -consists oF. 1) scarps and slumps in the upper areas, 2) <br />renewed movement and shearing within the older slide (the area south of the dvn and <br />wcstem part of the reservoir and a linear shear zone parallel to the axis oC the dam on <br />• <br />831-032.621 Wright Water Engineers. Inc. Page 23 <br />November 2004 <br />