From the South trailhead take Maple to First then make a right through old Snohomish to Avenue D. Make a left and cross the railroad tracks. Springhetti and Lowell – Lattimer and the related routes are straight ahead. Lowell River Road takes off on your right and you can follow it to Everett.
Alternatively take Pine from the South trailhead until it curves right next to some soccer fields and intersects Lincoln Ave. Lincoln becomes the Old Snohomish Monroe highway and you can follow it all the way to main street in Monroe.
If you’re going through town – say from Lowell-Snohomish River Rd. heading for Old Snohomish-Monroe Rd. – take First through old Snohomish and just follow it until it intersects Lincoln. First also intersects Maple which is what you want to follow if you’re heading for the Centennial trail. If you’re coming from Riverview on the North side of the river, turn right on First just after you go under SR 9. If you’re heading for the Centenninal trail from Riverview, turn left on 85th at the GAR cemetary and then turn right on 72nd and bear right as it turns into Bonneville Ave. At D Avenue pick up 10th and follow that to Maple. A right (downhill) puts you at the trailhead.