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The Atlas/Washington/Spirit Lake Highway (WA-504)

Spirit Lake Highway (WA-504)

WA-504 runs 52 miles from I-5 at Castle Rock east along the North Fork Toutle River to the Johnston Ridge Observatory at the edge of Mount St. Helens National Volcanic Monument — the only scenic byway in the US that enters a volcanic blast zone. Wide sweepers and bridges over canyon crossings characterize the road; the upper miles transition into the grey-ash landscape left by the 1980 eruption. The Johnston Ridge Observatory (visitor center, crater overlook) is the terminus. Note: a 2024 landslide damaged the upper stretch near the observatory; WSDOT expects full restoration by fall 2026 — check current conditions before riding.

43 mi
Length
0
Verified stops
—
High point
Scenic
Road type
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// Nearby & related
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