This is a great ride. Using roads that parallel HYW 20 you will work your way up to Concrete often along the river. Almost all the roads are chip seal but old enough to be worn down some. There are a couple Short sections of HWY 20. These sections have a nice wide smooth shoulder. There are few hills and a good deal of shade. There is very little traffic on this ride. If you want to go into town of Concrete at the East end of the ride it is only a couple extra miles. S Skagit Hwy is used by cyclists riding across America. We saw many fully loaded bikes headed East. We rode this on our tandem.