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<br />Ramsey County | Multi-Jurisdiction Hazard Mitigation Plan 23 <br />floodwaters. Failures of dams and levees can result in sudden and severe flooding. The causes of such <br />failures include natural hazards (earthquakes, flooding severe weather conditions), human-made threats <br />(terrorism, human error) or other key factors such as structural deficiencies or improper maintenance, <br />leading to compromise the integrity of the dam/levee. When a dam/levee fails, the rapid release of <br />water can inundate downstream areas, leading to loss of life, extensive property damage, and <br />environmental destruction. Populated areas, agricultural lands, and infrastructure located downstream <br />are particularly vulnerable to impacts. The cascading effects can also include disruption of utilities, <br />transportation networks, and other critical infrastructure. There are X number of dams, and no levees, <br />located in Ramsey County. <br />3.5.2 LOCATION <br />Figure 35 Dams Located in Ramsey County illustrates the dams that are located within the Ramsey <br />County geographical boundaries. There are also three additional dams outside the county’s borders that <br />have been identified as potential risks to the county - Coon Rapids Dam in Anoka County and St. <br />Anthony Falls Upper and Lower Lock and Dams in Hennepin County. <br />Figure 3 Dams Located in Ramsey County <br />Name Owner River Primary <br />Purpose <br />Year <br />Built <br />NID <br />Height <br />Dam <br />Type <br />Classification <br />Arlington <br />Detention City of St. Paul <br />Phalen <br />Creek <br />tributary <br />Flood Risk <br />Reduction 1989 15' Earth Significant <br />Battle Creek <br />WD of <br />Ramsey- <br />Washington <br />Metro <br />Battle Creek Flood Risk <br />Reduction 1982 30' Earth High <br />Battle Creek <br />Middle <br />WD of <br />Ramsey- <br />Washington <br />Metro <br />Battle Creek Flood Risk <br />Reduction 1983 16' unk High <br />Battle Creek <br />Upper <br />WD of <br />Ramsey- <br />Washington <br />Metro <br />Battle Creek Flood Risk <br />Reduction 1983 18' unk High <br />Hansen Park City of New <br />Brighton <br />Rice Creek <br />tributary Recreation 7’ Low <br />Keller Lake RWMWD Keller Creek Recreation 1938 12' Gravity Low <br />Round Lake USFWS Rice Creek <br />tributary Water Supply 1960 10' Other, <br />Earth Low <br />Source: National Inventory of Dams, Minnesota DNR <br />3.5.3 EXTENT <br />In the U.S., a common practice among federal and state dam safety officials is to classify dams according <br />to the potential impact a dam failure or breach would have on upstream or downstream areas or