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The highest road in Washington is in the far North Cascades, accessed from the eastside at Mazama, near Winthrop. The drive up to Harts Pass and then up to Slate Pass can be done with any car but a bit of clearance will make it much more enjoyable. If you are new to back-road driving, you might find this road dangerous in one section.
High Roads of WA
Washington's Highest Roads

Harts Pass and Slate Pass

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Free camping on the west side of Harts Pass on Slate Creek
Slate Pass Road
Slate Pass Road
Closed road from Slate Pass to Slate Peak
You dont need a Jeep to get to the highest drivable road in Washington
End of the road at Slate Pass, can walk up to Slate Peak in the distance
Views from Slate Pass
Harts Pass Guard Station at Harts Pass
Showing location of the Harts Pass Road/Slate Pass Road