(Seattle, WA)  --  The Seattle Department of Transportation is sending crews to Portland to assist with efforts to dig the city out from under about a foot of snow.  The Portland Bureau of Transportation says it began reaching out to other Northwest departments for help, once it realized how much snow was likely to fall.  Seattle transportation officials say they're sending equipment that includes heavy salt-spreading trucks and plows, a chainsaw crew and wood-chipper truck, an aerial-lift truck, and a few light-duty, salt-and-plow vehicles.  Governor Kate Brown and Portland Mayor Ted Wheeler are urging drivers to stay off the roads until conditions improve.