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