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<br />Ramsey County | Multi-Jurisdiction Hazard Mitigation Plan 54 <br />A flood’s crest is the level at which a river peaks before it starts to recede. Figure 8 shows historical flood <br />crests for flooding in the Mississippi River at Saint Paul and South Saint Paul, as well as historical flood <br />crests for Rice Creek in Mounds View. <br />Figure 8. Historical Flood Crests <br />Historical Flood Crests for <br />Mississippi River at Saint Paul, <br />MN <br /> <br />Date Height <br />(Feet) <br />4/16/1965 26.01 <br />4/15/1969 24.52 <br />4/18/2001 23.76 <br />4/30/2001 23.20 <br />4/13/1997 22.37 <br />4/16/1952 22.02 <br />3/31/2013 20.19 <br />6/29/2024 20.17 <br />(P) <br />6/26/2014 20.13 <br /> <br /> <br />Historical Flood Crests for <br />Mississippi River at South Saint <br />Paul, MN <br /> <br />Date Height <br />(Feet) <br />4/29/2001 703.04 <br />4/18/2001 703.03 <br />4/13/1997 702.90 <br />6/26/2014 700.94 <br />6/25/1993 699.98 <br />3/30/2011 698.95 <br />3/24/2010 698.56 <br />7/02/2013 694.84 <br />6/03/2012 694.02 <br />4/01/2009 693.87 <br /> <br /> <br />Historical Flood Crests for Rice <br />Creek in Mounds View, MN <br /> <br />Date Height <br />(Feet) <br />6/19/2014 12.25 <br />8/16/2011 11.17 <br />5/24/2012 10.49 <br />5/19/2013 10.43 <br />3/22/2010 9.55 <br />7/6/2015 9.45 <br /> <br /> Source: NOAA Water Prediction Service <br />3.8.5 PROBABILITY <br />Minor flooding is an annual occurrence in Ramsey County. According to the Storm Events Database, six <br />major flood events occurred over the 32-year period presented, with a probability of a major flood <br />event every 5 years. Fifteen flash/urban flooding events occurred in the same period, presenting a <br />probability of almost one major flash flood every two years. As storms become more severe and rainfall <br />becomes heavier, these probabilities may increase. <br />3.8.6 CLIMATE CHANGE IMPACTS <br />Climate change could significantly impact riverine flooding through changes in seasonal and increased <br />precipitation and intensity, changes in snowmelt and runoff patterns, increased stress on flood <br />management infrastructure, such as dams, levees, and stormwater systems, and altered river and <br />watershed dynamics. These changes may result in rising river levels, increased risk of flood-related <br />damage, and more intense and frequent flooding events. <br />Similarly to potential changes to riverine flooding, climate change could also impact flash flooding <br />through increased frequency and intensity of heavy rainfall, altered seasonal precipitation patterns, and <br />stress on stormwater infrastructure. In addition, increased urbanization and expanded impervious <br />surfaces, changes in land use and vegetation, and changing soil and drought cycles may lead to more <br />frequent and severe flash floods, with higher runoff and rapid onset, particularly in urban areas of the <br />county.