Seems all this is nothing new. Portland had shanty towns once before.

Homelessness was present before the Great Depression, and hobos and tramps were common sights before 1929. Most large cities built municipal lodging houses for them, but the depression exponentially increased demand. The homeless now clustered in shanty towns close to free soup kitchens. These settlements were often formed on empty land and generally consisted of tents and small shacks. Authorities did not officially recognize these Hoovervilles and occasionally removed the occupants for trespassing on private lands, but they were frequently tolerated or ignored out of necessity.

http://en.wikipedia.org/wiki/Hooverville

http://en.wikipedia.org/wiki/File:Hoooverville_williamette.jpg

http://www.koin.com/2013/08/28/fight-over-burnside-homeless-camp/