Motorcycle Ride Planner · Routes · United States

Mount St. Helens Spirit Lake Memorial Highway (WA-504)

United States · WA-504

High-speed, sweeping mountain highway built post-1980 eruption leading straight into the blast zone. Features huge engineered viaducts, canyon bridges, and spine-tingling views right into the steaming volcanic crater.

Mount St. Helens Spirit Lake Memorial Highway (WA-504) runs 52 miles between Castle Rock (I-5), WA and Johnston Ridge Observatory, WA. We count about 230 corners along it, which is consistently bendy. Committed riding: real corners, real consequences.

Tank-bag quick reference

• StartCastle Rock (I-5), WA46.2754, -122.9079
• High100 ft - 4,200 ftelevation range
• EndJohnston Ridge Observatory, WA46.2755, -122.2172

T-CLOCS before you go: tyres and wheels, controls and cables, lights and electrics, oil and fluids, chassis and stand.

Repair within reach

• 46 miPro Caliber Motorsports VancouverVancouver, United States
• 51 miMotoSport HillsboroHillsboro, United States

Straight-line distance from the start of the route, not driving distance.

More in United States

• California Route 36 - '140 Miles of Curves'140 mi · 1800 corners
• Blue Ridge Parkway (Virginia Ridge & Peaks of Otter)176 mi · 620 corners
• Blue Ridge Parkway (Southern High Peaks Section)129 mi · 580 corners
• The Snake 421 (Holston Mountain Pass)33 mi · 489 corners
• Coronado Trail (The Devil's Highway)92 mi · 460 corners
• Lolo Pass (Lewis and Clark Highway)132 mi · 450 corners

Questions riders ask

How long does Mount St. Helens Spirit Lake Memorial Highway (WA-504) take to ride?

About 52 miles. At an unhurried pace with stops that is roughly 1 hour of riding, longer if you are stopping for photographs.

Where does Mount St. Helens Spirit Lake Memorial Highway (WA-504) start and end?

It runs between Castle Rock (I-5), WA and Johnston Ridge Observatory, WA. Either end works as a start; the route reads the same in both directions.

Is Mount St. Helens Spirit Lake Memorial Highway (WA-504) a twisty road?

We count about 230 corners across 52 miles, which is consistently bendy.

Is there a GPX file for Mount St. Helens Spirit Lake Memorial Highway (WA-504)?

Yes. The GPX is free, there is no account, and the planner will build a route that includes this road alongside others nearby.

Where these numbers come from

Distances and corner counts come from the route's own geometry, not from ratings or votes. Nothing here is crowdsourced and nobody paid to appear.