Mystery Christmas smoke plume in Washington State

Took a Christmas walk with family along Willows Beach in Oak Bay and spotted a smoke plume in what I believe was Washington State. Here's a highly magnified view of the mystery plume. I've assumed it was from a fire rather than an industrial site such as a pulp mill.

Checked Google News but didn't find anything about it.

December 26, 2009 Update: Checked Google Earth and plotted a path. The line extends through Whidbey Island, Camano Island, Stanwood and possibly Everett, Washington State. There is a waterfront mill operation and an adjacent U.S. naval station  at Everett, so more than likely the smoke plume originated from one of those two sites.



Here is a screen shot of "Mill Town" at Everett, Washington, from Google Maps Street View showing the mill with a thin plume of smoke.