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Ramsey County Multi-Hazard Mitigation Plan, 2018 <br /> <br />Page | 97 <br /> <br />Vulnerable Areas – Identify and map areas that are susceptible to both natural and manmade landslides or <br />karst and develop plans or projects to place riprap or barriers where needed. Promote proper <br />construction development or use of retaining walls where needed. <br />4.4.12 Dam Failure <br />Dams are structures that retain or detain water behind a large barrier. When full or partially full, the <br />difference in elevation between the water above the dam and below create large amounts of potential <br />energy, allowing the chance for failure. Dams can fail due to either 1) water heights or flows above the <br />capacity for which the structure was designed; or 2) deficiencies in the structure such that it cannot hold <br />back the potential energy of the water. If a dam fails, issues of primary concern include loss of human <br />life/injury, downstream property damage, lifeline disruption (transportation routes and utility lines <br />required to maintain or protect life), and environmental damage. Dams require constant monitoring and <br />regular maintenance to insure their integrity. <br />Dam Failure History in Ramsey County <br />There have been no dam failures in Ramsey County in the past. There have been no known deaths, <br />injuries, or property damage from dam or levee failures in the County. The effects on life and property <br />in the area could be significant if a dam were to fail because of the nature of the built environment. <br />Table 26 below summarizes data on Ramsey County’s dams. They are also mapped in Figure 23. The <br />dams with Emergency Actions Plans are Lock and Dam no. 1, Battle Creek, Battle Creek Middle and <br />Battle Creek Upper. There are no levees in Ramsey County. <br />Table 26. Dam Data for Ramsey County (National Inventory of Dams & MN DNR) <br />Name Owner River Primary <br />Purpose <br />Year <br />Built <br />NID <br />Height <br />Dam <br />Type <br />Arlington Detention City of St. Paul Phalen Creek <br />tributary Flood Control 1989 15' Earth <br />Battle Creek WD of Ramsey- <br />Washington Metro Battle Creek Flood Control 1982 30' Earth <br />Battle Creek Middle WD of Ramsey- <br />Washington Metro Battle Creek Unknown 1983 16' Unknown <br />Battle Creek Upper WD of Ramsey- <br />Washington Metro Battle Creek Unknown 1983 18' Unknown <br />Keller Lake Ramsey County Keller Creek Other 1938 12' Gravity <br />Round Lake Federal Cartridge <br />Corp. <br />Rice Creek <br />tributary <br />Water Supply, <br />Other 1960 10' Other, <br />Earth <br />Lock & Dam #1 <br />USCOE & Ford <br />Motor Co & <br />Brookfield <br />Mississippi <br />River Hydroelectric 1917 51' Concrete