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l <br /> { <br /> ` ~ Figure 9: Sample <br /> View Threshold 5% reduction in viewshed <br /> ~ area triggers restoration VIEWSHED <br /> These pictures show how a <br /> baseline view might be used <br /> f j to determine when view <br /> ~ restoration needs to occur. <br /> Figure 9a could show the ' <br /> baseline viewshed. Figure 9b Y - <br /> ~ is digitally modified to show <br /> ! how the views might change <br /> over several years and trigger <br /> restoration efforts. ` ~ ~ ~ ° ' ' ' <br /> 9a -Hypothetical photo of baseline view (note that 9b -Hypothetical photo after several years shows <br /> actual baseline view will be taken after views are how a reduction in the viewshed area would trigger u7 <br /> restored to approximate 1990 levels) restoration <br /> } Judkin's Point, the Cuthbert Amphitheater, ~ <br /> butte need to be protected or mitigated, the University of Oregon, and Autzen c~ <br /> appropriate native trees that are not likely Stadium. This list may be updated with ~j <br /> to compromise the views in the future can Parks Planning Manager approval. <br /> f.> be planted as replacements. <br /> Bas® Line Views <br /> Mitigating Undesirable Views An acceptable baseline for panoramic and <br /> 1--~ Viewsfromandtowardsthebuttemayalso specific view preservation shall be <br /> a be improved through mitigation of established at the views approximately <br /> - undesirable elements in the views such as present in 1990. This means that some <br /> power stations or other utilities, obtrusive restoration will need to occur now to return <br /> signs, etc. Considering that some views to that general condition. The <br /> undesirable views may change in the future, baseline should be established through a <br /> however, this tool should be exercised combination of restoration of existing <br /> carefully. general views (generally towards what <br /> would have been expected in 1990) and <br /> re-opening of specific views. <br /> E ~ Methodology <br /> Establishing the Base Line <br /> ' ' Threshold Approach to View A record of the baseline will be set by <br /> Restoration photographing panoramic views and <br /> j ~ j This approach involves setting an objective specific views from significant view points <br /> ~ baseline for the level to which views may (see Figure 8) and calculating the area <br /> be blocked before restoration occurs. It between the tree tops and the horizon (see <br /> shall be quantifiable and objective, based Figure 9). Following restoration to baseline <br /> . on criteria established through the (1990) levels, photographs will be taken <br /> Viewshed Mangement Plan. from specific, fixed points (monuments) <br /> placed permanently on the butte on an <br /> ~ Panoramic Views and Specific Views annual orsemi-annual basis in a consistent, <br /> ' Desirable panoramic views include a prescribed manner, and compared to the <br /> panorama of downtown Eugene, the south baseline. The horizontal and vertical <br /> ~ hills, the Cascades, the Coast Range and location of these monuments shall be <br /> ~ west Eugene (see Figure 8 for major recorded, and the cameral height above <br /> Yiew preservation panoramic viewpoints), In addition, views ground, angle, lens lenght and time ofyear <br /> criteria should be of specific, local features of cultural and shall be established and remain consistent <br /> natural interest will be listed for for all future comparison. <br /> c_ quantifiable and <br /> objective preservation. Specific views shall include: ~ <br /> the Willamette River, the Three Sisters, <br /> ' Spencer Butte, Gillespie Butte, Willamette <br /> - Street, the Hilton Hotel, the Hult Center, <br /> . ~ <br /> li <br /> f___ <br /> i <br /> <br /> -j Skinner Butte Park • Master Plan 2001 75 <br /> <br />