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Chapter IS:Risk Assessment <br /> Pik <br /> Source: <br /> CeIISUS BUI-CaU <br /> PDC(Pacific Disaster Center) <br /> County of Hawaii <br /> • Bridges <br /> Accuracy: <br /> Roads USGS Quad <br /> Major Roads <br /> Figure 18-11. Roads and Bridges <br /> Roads and bridges may be (and have been) affected completely by stream flooding,tsunamis, <br /> earthquakes, and landslides. The 7.2 magnitude Halape earthquake in 1975 not only damaged <br /> roads in the Volcano area but caused landslides that affected the highway at Laupahoehoe <br /> and Honomu.91 The heavy rain and flooding in November 2001 completely blocked a major <br /> road in Hilo and the only highway through Ka'u. The tsunami of 1946 ruined the railroad <br /> bridges at Wailuku River and Kolekole stream(the railroad right-of-way is now highway 19). <br /> Several bridges on this coast are now being reinforced against earthquake damage which may <br /> also make them more resistant to tsunami or hurricane storm surge. Ali'i Drive in Kailua is <br /> susceptible to these hazards but there are alternate routes. Figure 18-11 identifies the bridges <br /> on the major roads. Future updates to this plan will identify road segments and bridges that <br /> are within the VE zone (at risk to tsunami and hurricane surge), the bridges that have been or <br /> are programmed for reinforcement, and the highway segments that have experienced past <br /> closure from landslides with no alternate routes. Key repairs were made after the 2001 flood <br /> to bridges that have required repetitive repairs. <br /> 91 USGS <br /> 18-28 Hawaii County Multi-Hazard Mitigation Plan <br />