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<br />Ramsey County | Multi-Jurisdiction Hazard Mitigation Plan 36 <br />3.7.3 EXTENT <br />In hazard analysis, the 100-year and 500-year floodplains maps are utilized for understanding flood risk <br />and informing land-use planning, emergency response, and infrastructure development. These <br />designations represent areas that have a 1% (100-year) and 0.2% (500-year) chance of flooding in any <br />given year. These maps help identify areas most at risk of flooding, which is vital for minimizing damage <br />and ensuring public safety. <br />100-Year Floodplain: This area is commonly used as the baseline for regulatory and insurance purposes. <br />It is the standard by which flood insurance requirements are determined, and it guides zoning <br />regulations, construction codes, and infrastructure projects. Because these areas are more likely to <br />experience flooding, they are most often prioritized for flood prevention and mitigation measures. <br />500-Year Floodplain: Although the likelihood of flooding in these areas is lower, the 500-year floodplain <br />helps to identify areas that could be affected by more extreme events, including critical infrastructure, <br />such as hospitals, emergency facilities, and power plants, where the consequences of flooding would be <br />severe. <br />3.7.4 HISTORY <br />The National Climatic Data Center Storm Events Database was consulted for records of historical floods <br />and flash flooding. The earliest records occurred in 1997. Since 1997, Ramsey County has experienced <br />six major flood events, causing $4.3 million in property damage and no injuries or fatalities. The county <br />has also experienced fifteen major flash flood events causing over $700k in property damage, one <br />fatality and one injury. Figure 8 shows flood and flash flood history in Ramsey County. <br />Figure 8. Ramsey County Historical Floods, 1997 - August 2024 <br />Location or County Date Type Deaths Injuries Property <br />Damage <br />Federally <br />Declared <br />Disaster <br />Saint Paul 7/5/2020 Flash <br />Flood 0 0 Unknown <br />Ramsey County March – April <br />2019 Flood 0 0 unknown Yes <br />Saint Paul 9/17/2015 Flash <br />Flood 0 0 unknown <br />Saint Paul 6/18/2014 Flood 0 0 $1,900,000 Yes <br />Falcon Heights 6/21/2013 Flash <br />Flood 0 0 unknown <br />Saint Paul 6/21/2013 Flash <br />Flood 0 0 unknown <br />New Brighton 8/16/2011 Flash <br />Flood 0 0 unknown <br />White Bear Lake 7/16/2011 Flash <br />Flood 0 0 $500,000 <br />Ramsey County 3/16/2011 Flash <br />Flood Unk Unk Unknown Yes <br />Little Canada 8/10/2010 Flash <br />Flood 0 0 unknown