Laserfiche WebLink
<br />Ramsey County | Multi-Jurisdiction Hazard Mitigation Plan 62 <br />Est. Date Type Location Deaths/ <br />Injuries <br />Property <br />Damage <br />Description <br />injured in the response. <br />June 19, <br />2014 <br />Landslide Saint Paul u/k u/k Sediment. Heavy rainfall <br />caused a landslide beneath <br />a hospital at the <br />University of Minnesota. <br />April 28, <br />2018 <br />Landslide Saint Paul 0/0 $766k An estimated 400,000 <br />pounds of rock and soil <br />came loose on the bluff to <br />cover Wabasha Street <br />between Plato Boulevard <br />and Cesar Chavez Street. <br />9 <br />Significant <br />Incidents <br />-- -- 2/4 $766,000 <br />total <br />claimed <br />-- <br />Sources: MN DNR and 2019 Ramsey MHMP <br /> <br />During Planning Meeting #2, members of the LPT noted a landslide in Gem Lake that caused disruption <br />to nearby railroad tracks, although further research didn’t find any written record of it. <br /> <br />3.9.5 PROBABILITY <br />Geologic hazard incidents are an occasional occurrence within Ramsey County. Six significant incidents <br />have occurred since 1970, giving a probability of approximately an 11% chance of a significant geologic <br />hazard incident occurring within any given year. During Planning Meeting #2, the LPT noted that <br />mitigation of geologic hazard risks has been implemented across the county; as mitigation continues, <br />probability of incidents will decrease. <br />3.9.6 CLIMATE CHANGE IMPACTS <br />Climate change can significantly influence geologic hazards in Rasmey County through various <br />mechanisms. Here are some key impacts: <br />• Increased Frequency of Heavy Rainfall: More intense and frequent heavy rainfall can saturate <br />soils, increasing the likelihood of landslides, especially in areas with steep slopes or unstable <br />terrain. It can also lead to more frequent and severe flooding, which can erode riverbanks and <br />destabilize the ground, potentially triggering landslides and soil erosion. Heavy rains in <br />Minnesota are now more frequent and intense than ever recorded. Long-term observation sites <br />have shown significant increases in 1-inch and 3-inch rainfalls, as well as the heaviest annual <br />rainfall events. Since 2000, the state has also experienced a notable rise in widespread extreme <br />rainstorms. Rainfalls that historically ranked in the top 2% are becoming more common. Climate <br />projections suggest that these heavy rains will continue to increase in the future. <br />• Temperature Extremes: Increased variability in temperatures can lead to more frequent freeze- <br />thaw cycles, which can cause soil and rock to expand and contract. This process can weaken <br />slopes and contribute to landslides and rockfalls. Minnesota has warmed by 3.0°F between 1895 <br />and 2020, with the most dramatic changes occurring in recent decades. Since 1970, nearly every