What combination of factors both natural and manmade is necessary for healthy river restoration and how does this enhance the sustainability of natural and human communities? Objective How did an 1881 law in Washington interfere with the support of the building of the Elwha Dam and what was the consequence for salmon? What did the building of the dam do for the economy of the Port Angeles area? Background How did an 1881 law in Washington interfere with the support of the building of the Elwha Dam and what was the consequence for salmon? What did the building of the dam do for the economy of t Duration: 60 Minutes.