"From Sedro-Woolley, the trail passes through flats, farmland, and forest, and at times it hugs the Skagit River on its way to the town of Concrete (former name: Cement City), made famous in Tobias Wolfe’s novel, This Boy’s Life. Because the trail follows an old rail line, the grade is never more than 1 or 2 percent, and inclines are just about imperceptible. The trail is about 70 feet above sea level in Sedro-Woolley, about 230 feet above sea level in Concrete.
This low elevation ensures that the trail is usable pretty much year-round. And since it’s built on railroad ballast, it drains especially well; there aren’t a lot of muddy spots. Trail users often spot bald eagles, great blue herons, and, in an 80-acre corridor of preserved land about 4 miles west of Concrete, up to sixty elk that call the area home. Locals refer to this area as “Elk Meadows.”"