Tragic Day in Portland's history

https://en.wikipedia.org/wiki/Vanport,_Oregon

"Vanport was dramatically destroyed at 4:05 p.m. on May 30, 1948, when a 200-foot (61 m) section of the dike holding back the Columbia River collapsed during a flood, killing 15. The city was underwater by nightfall leaving its inhabitants homeless."

"The Vanport Flood parallels the more recent Hurricane Katrina disaster in New Orleans. In both cases, public officials led the population to believe that the damage would be slight, and in both cases the government response to the disaster was harshly criticized. Critics attributed the poor response, in both cases, to racist attitudes on the part of officials, who allegedly neglected to respond appropriately to the destruction of predominately black communities"