Portland To Mt St Helens Map & Driving Directions
The easiest access from Portland is the shortest —109 miles, a little over a 2-hour drive.
Head north on Interstate 5 ( I-5) through Vancouver, WA, USA, to Woodland, Exit 21.
Here you will head east on Washington Highway 503 past Lake Merwin, Yale, and Swift Creek Reservoir.
Continue on what becomes Forest Road (paved, not gravel) 90 to the Pine Creek Information Station at the junction of FR 25.
Here you turn north on FR 25, which will lead to the Windy Ridge Road FR 99