Table 1: Dam removal in the US Year of removal Number removed Average height (m) Maximum height (m) 1920-1950 16 4 7.9 1951-1980 31 7.5 17.1 1981-1990 92 7.1 38.1 1991-2000 137 6.2 48.8 2001-2008 154 3.5 18.3 Note: Includes only dams for which height and year of removal are known