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Three types of passage structures were installed and <br />dimensions of each type are found in Tables 7-10. Type I, <br />(Culvert overpass structures), were constructed as circular <br />earthen ramps bisected by the conveyor. These bridges were <br />at least 5.8 meters wide and 30 cm of soil were placed on <br />top of the structure. Approach ramps were constructed to <br />fan out 180 degrees at the toe of the fill slope. Overpass <br />ramps were constructed with approach widths of 5 ramps <br />averaging 13.2 meters and one extra wide ramp (Station OP-4) <br />with an approach width of 64 meters (Table 7). Animals <br />observed at this station took more time to graze while <br />crossing the ramp and tracks appeared less crowded due to <br />the increased area and vegetation at the top and sides of <br />the ramp. A typical cross sectional side view of the <br />structure is illustrated in Figure 4. Photograph 1 shows <br />mule deer track set across a snow covered 12 meter long <br />culvert overpass. During one transect run, a mule deer was <br />photographed grazing on top of a culvert overpasss (OP-1) <br />structure - Photograph 2. <br />Top of Ftll <br />Culvert <br />Figure 4. Crass Sectional Side mew -Typical Overpass Structure. <br />Access Road <br />Drairroge <br />