I've lived in the Portland/Vancouver area my whole life.
It probably snows here combined in the winter like 10 inches.
They never use salt and here in Clark County (Vancouver) they don't even use gravel anymore.
My uncle works for the county and says the biodegradable and enviro friendly chemicals they spray on the roads (much like a water truck to keep dust down in construction sites, etc) is WAY more cost effective than gravel or salt.
The winters here aren't gnarly enough for them to waste a bunch of the state's/county's money on salt or extended efforts to make the 1" snow covered roads "drivable."
If anyone is in this area, you'll know what I mean with the lack of funding and weak winters we have.
That's all,
Dan