Dams are frequently located upstream from major population centers: . 1918--1958: 33 Major dam failures resulting in 1680 documented fatalities . 1959--1965: 9 major dams failed throughout the world . 1976: Teton Dam failure in Idaho . ... The Salmon Problem: . ... Some Federal Dam Licenses can now be lost because of salmon migration problems . ... Actual Salmon Count data is available for these dam sites: . John Day Dam . Bonneville Dam . ... Adverse effects of dams on salmon: . ...