Table 4: Proportion of hydro dams removed by region Region Total Number of FERC Recognised Hydro Projects Total No. of Hydro Dams Removed % of Total FERC Licensed FERC Exempt Pacific 257 247 504 12 2.4% Desert 30 27 57 1 1.7% Central 210 65 275 5 1.8% Great Lakes 52 10 62 2 3.2% East Atlantic 487 254 741 10 1.3% Continental US 1036 603 1639 30 1.8%