If your an amateur astronomer, you are always on the quest for dark skys.  I often use the cleardarksky.com alarm clock to let me know of favorable conditions at my favorite observing sites.  I took the dataset for the light pollution and overlaid it inside of google earth.  It offers an interesting view of the light pollution from Portland.    From the map below, my house falls in the red area, which is not good.  The Salmonberry observation spot is in a cool blue zone, which is pretty dark given the distance from Portland.  Of course the Hancock Field Station, as well as the Oregon Star Party are located in the very dark black zone, which makes for amazing viewing.   There are some pictures from both of these locations in my gallery.