Single track on both sides of the railroad track. On the right near the top there are several significant jumps and drops. This tends to get sloppy in the winter, so expect some mud. It is in close and a good way to burn a couple of hours. Mostly up hill on the way out and a more enjoyable trip back.
From I-5 - Take the 41st street exit. Head west the road will eventually turn into Mukilteo Blvd. Follow Mukilteo Blvd. for several miles into Mukilteo. Take the dirt road on the left after the bridge over the train tracks. This is easy to miss!
http://www.singletracks.com/item.php?c=1&i=1557