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Anoka County <br />MINNESOTA <br />Respectful, Innovative, Fiscally Responsible <br />Anoka County 2019 <br />Multi -Jurisdictional <br />All Hazards Mitigation Plan <br />Annual Rainfall for Anoka County <br />year <br />Jan <br />Feb <br />Mar <br />Apr <br />May <br />Jun <br />Jul <br />Aug <br />Sep <br />Oct <br />Nov <br />Dec <br />2018 <br />0.66 <br />1.40 <br />1.77 <br />2.12 <br />2.09 <br />4.90 <br />4.16 <br />2.74 <br />4.78 <br />3.02R <br />1.61 <br />1.20 <br />2017 <br />0.73 <br />0.68 <br />0.54 <br />3.53 <br />5.41 <br />3.90 <br />2.70 <br />5.76 <br />1.67 <br />4.40 <br />0.66 <br />0.59 <br />2016 <br />0.24 <br />0.79 <br />1.72 <br />2.75 <br />3.44 <br />3.66 <br />6.02 <br />6.77 <br />5.24 <br />3.08 <br />2.54 <br />1.93 <br />2015 <br />0.18 <br />0.33 <br />0.60 <br />2.15 <br />4.82 <br />3.74 <br />6.89 <br />3.61 <br />2.87 <br />3.31 <br />3.74 <br />1.51 <br />2014 <br />0.91 <br />1.06 <br />0.74 <br />7.23 <br />4.86 <br />10.90 <br />1.96 <br />5.27 <br />2.11 <br />0.96 <br />1.52 <br />1.05 <br />2013 <br />0.69 <br />1.21 <br />2.10 <br />3.84 <br />4.35 <br />5.08 <br />3.55 <br />0.87 <br />2.08 <br />4.07 <br />0.71 <br />1.78 <br />2012 <br />0.53 <br />1.63 <br />1.49 <br />2.49 <br />10.84 <br />3.27 <br />5.27 <br />0.81 <br />0.57 <br />2.03 <br />0.88 <br />1.55 <br />2011 <br />0.91 <br />0.96 <br />2.43 <br />2.88 <br />7.89 <br />3.77 <br />9.90 <br />3.60 <br />0.72 <br />0.65 <br />0.16 <br />0.48 <br />2010 <br />0.51 <br />0.69 <br />1.06 <br />2.03 <br />3.32 <br />6.91 <br />4.43 <br />5.26 <br />5.95 <br />1.80 <br />2.04 <br />2.51 <br />2009 <br />0.45 <br />0.76 <br />1.59 <br />1.04 <br />0.65 <br />4.09 <br />2.41 <br />7.68 <br />0.92 <br />5.67 <br />0.55 <br />1.99 <br />2008 <br />0.08 <br />0.45 <br />1.39 <br />3.34 <br />3.79 <br />4.15 <br />2.61 <br />1.80 <br />3.07 <br />1.60 <br />0.97 <br />1.31 <br />2007 <br />0.90 <br />1.00 <br />2.46 <br />2.09 <br />1.88 <br />1.28 <br />1.79 <br />6.26 <br />5.26 <br />6.02 <br />0.05 <br />1.77 <br />2006 <br />0.37 <br />0.61 <br />1.30 <br />3.52 <br />3.42 <br />3.92 <br />1.38 <br />6.01 <br />4.47 <br />1.32 <br />1.13 <br />1.60 <br />2005 <br />2.06 <br />0.85 <br />1.15 <br />1.92 <br />3.16 <br />6.13 <br />2.37 <br />3.14 <br />7.44 <br />6.46 <br />2.15 <br />0.97 <br />2004 <br />0.38 <br />1.17 <br />2.27 <br />2.50 <br />7.11 <br />3.81 <br />2.97 <br />2.39 <br />5.29 <br />4.13 <br />0.93 <br />0.46 <br />2003 <br />0.20 <br />0.84 <br />1.55 <br />3.07 <br />5.80 <br />7.25 <br />2.52 <br />0.73 <br />2.55 <br />1.31 <br />0.90 <br />0.84 <br />2002 <br />0.37 <br />0.93 <br />1.93 <br />4.15 <br />3.79 <br />6.01 <br />7.06 <br />6.36 <br />5.08 <br />4.50 <br />0.15 <br />0.26 <br />2001 <br />1.45 <br />1.81 <br />0.76 <br />8.52 <br />4.24 <br />4.09 <br />2.39 <br />3.85 <br />2.99 <br />0.88 <br />3.03 <br />0.90 <br />2000 <br />0.77 <br />1.43 <br />0.96 <br />1.91 <br />2.18 <br />4.25 <br />3.79 <br />2.52 <br />0.87 <br />1.21 <br />4.16 <br />1.27 <br />Columbia Heights also experienced flood ng citywide in 1997, with street flooding and flooding <br />of structures in low areas. The likelihood of occurrence is considered moderate. Loss impact of <br />future occurrence is less likely due to mitigation projects to correct flooding problems although <br />the impact will continue to be moderate. <br />Coon Rapids located along the east bank of the Mississippi River experienced flooding from the <br />Mississippi River in April of 1965, 1997 and 2001. All three years were the result of heavy spring <br />rains combined with heavy winter snowfall amounts in the Mississippi River drainage areas. <br />The southwest corner of the city requires sandbagging for approximately 25 homes. Additional <br />sandbagging is necessary for an additional 12 properties in the northwest corner of the city. The <br />river overflowing its banks threatens homes and property, utilities, and back -flooding of sanitary <br />and storm water sewer systems. Out of banks flooding is likely to occur once or twice per <br />decade. Future impact is considered moderate. <br />Blaine experiences minimal localized flooding with extensive rains and melting snow runoff, but <br />occurrences are infrequent and the impact minimal. <br />Oak Grove which is located adjacent to the Rum River and experiences minimal flooding with <br />extensive rains and melting snow runoff but occurrences are infrequent and the impact minimal. <br />Lino Lakes, Spring Lake Park and St. Francis experience storm -water flooding during periods of <br />heavy rain. The flooding is infrequent and the impact minimal. <br />Anoka County has several dams within planning area. The inundation threat to business and <br />residential areas from a failure is low based on the location of the dams and a review of the <br />Emergency Action Plan for each of the dams that are required to have an emergency action <br />plan. The plans for the Coon Rapids Dam and Oronoco Dam were reviewed and the risk to <br />93 <br />Commented [RK105]: Included additional details regarding <br />flooding risks from dam failures. A review of the dams in the <br />around found a low risk to residential and businesses from <br />dam failures. <br />