Resolution No. 5303 - Laserfiche WebLink

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Eugene -Springfield Area Natural Hazards Mitigation Plan 2. Hazard Descriptions levee, known today as the 42nd Street Levee, successfully contained the January 1964 and February 1996 flood incidents. The flood hazard areas shown on the current Flood Insurance Rate Maps (FIRM) for Eugene -Springfield assume the dams are operating properly. Dam failure hazards are not addressed by the FIS or the FIRM. Despite the reduction in flood potential from the construction of dams, the Eugene - Springfield area continues to have flood risk from major rivers as well as from the numerous creeks and sloughs running through the area. Flood risk on these smaller streams has not been reduced by the dams on the larger rivers and their tributaries. A historic statewide flood incident with local impacts occurred in February 1996. Unusually heavy rains over the four -day period from February 5th to February 8th resulted in significant flooding on numerous rivers and streams throughout western Oregon. During the incident, rising waters in the McKenzie River forced the evacuation of 1,200 to 1,500 people in low-lying areas of Springfield. hi the Springfield/Thurston area along the McKenzie River, 35-40 homes, about 20 private roads and bridges, and roughly 20 vehicles were damaged. Widespread flooding during February 1996 was also experienced in the Mohawk Valley from Marcola to Springfield with flooded homes on Sunderman Road and Goat Road. The Springfield Golf Course suffered substantial damage with about 6 inches of silt and debris deposited on the greens and fairways. There were widespread road closures in Lane County and Interstate 5 had water flowing across it just north of Eugene near the Boston Mill Road overpass.49 In December of 2005, days of heavy rains led to flooding on the Mohawk River near Springfield. The flood stage of the Mohawk is 15 feet. On December 31st, the river was at 18 feet. This area flooded again in January 2006 (reaching 17.8 feet), in 2012 [reaching 17.8 feet on January 19th (Figure 2-4)], and in December 2015 (reaching 15.42 feet.)51 49 United States. NOAA National Weather Service. Flooding in Oregon. Accessed August 2019. https://www.weather.gov/safety/flood-states-or so US Department of Commerce, NOAA, National Weather Service. "Mohawk River (OR) Near Springfield Water Gauge - Historic Crests." NOAA. Accessed November 17, 2017. http://water.weather.gov/ahps2/crests.php?wfo—pqr&gage—spro3&crest type —historic. 2-31 January 2020