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Eugene -Springfield Area Natural Hazards Mitigation Plan <br />4. Risk and Vulnerability <br />76. Cost to upgrade = $2, 250, 000. <br />There is one bridge in each City that provides a critical intercity link over a river or a <br />HWY that needs to be operational to access a hospital or other vital resource: <br />1) 6648: Ferry Street Bridge over the Willamette (Eugene)—Suff[Sufficiency] rating = <br />31. Cost to upgrade $2, 000, 000. <br />2) 09596: Mohawk Blvd over HWY 126 (Springfield) - Suff [Sufficiency] rating = 64. <br />Cost to upgrade = to be determined. <br />The 5 high priority bridges in the list above total $6,700,000. The phase 2 intercity <br />bridges above are estimated at $2, 000, 000 plus. <br />4.8 Impacts — Cascading Incidents <br />When a natural occurrence causes a man-made technological disaster, it is referred to as <br />a natech incident. Large-scale natech impacts are rare, so determining the exact <br />likelihood of their occurrence is difficult. Nevertheless, they may occur, so careful <br />consideration of how Eugene and Springfield's natural hazards could cause them is <br />imperative to understanding the risks faced by the Cities. To accomplish this, data and <br />incidents throughout modern history, across the United States, and in some cases <br />around the world, were reviewed. For each hazard the likelihood of it causing one of <br />the four cascading incidents was evaluated and categorized in Section 1 (Table 1-1 and <br />1-2). A summary of the natech evaluation process is included below and a review of the <br />natech impacts for each natural hazard are in Section 2. <br />4.8.1 Civil Unrest <br />Research suggests natural disasters increase the risk of civil unrest by at least 30% <br />especially when there is motive, incentive, and opportunity for such actions (Figure 4- <br />4). The exact number of civil unrest incidents induced by a natural hazard is hard to <br />determine due to different reporting methods, classifications, and societal compositions. <br />For this plan, significant civil unrest is considered as any large-scale illegal incident to <br />which law enforcement would have difficulty responding. This was weighed against the <br />area's incentives, motives, opportunities, and history to determine the likelihood of <br />such incidents occurring for each specific hazard. <br />4-23 January 2020 <br />