A dam on the river Elwha in the US state of Washington is being taken down after it caused an ecological imbalance in the region.<br /><br />Following its construction there was a severe decline in the fish population, a major resource for the local economy, with the number of salmon dropping from 400,000 to just 3,000.<br /><br />After decades of protests, the controversial dam is on its way out, and one of the world's largest ecological restoration projects is under way.<br /><br />Al Jazeera's Rob Reynolds reports from the site of the dam.
