(Photos by J. Maus/BikePortland)
On the official City of Portland bike map, NW St. Helens Road/Highway 30 looks like a nice solid bike lane (see below). It's the only north-south bike lane on the west side of the Willamette River between northwest Portland and Sauvie Island (and beyond). As such, this bike lane is an important route for many people — whether they're commuting to St. Johns or using it as a gateway to many popular riding destinations.
Unfortunately it's usually full of dirt, gravel, and other debris. It's so bad that I recently learned in some circles it's known as "Dirty 30".