// scenic road
North Cascades Highway (WA-20)
- Category
- scenic road
- Region
- washington
- Distance
- 375.0 mi
- Avg ride time
- 8 hr 20 min
Washington's WA-20 over the North Cascades — Diablo Lake's turquoise water, Washington Pass at 5,477 ft, and the wildest pass crossing in the Lower 48. The North Cascades stretch is mile 44-130 of the larger WA-20 chain imported here.
// highlights
- mile 44.4
Marblemount, WA
Last fuel before the park — gas, espresso, and the Skagit BBQ stop everyone recommends before the climb.
- mile 70.8
Diablo Lake Overlook
The shot. Glacier-fed turquoise reservoir framed by Davis Peak and Sourdough Mountain — wide pull-off, restrooms.
- mile 73.4
Ross Lake Overlook
View north along the 23-mile reservoir into Canada — interpretive signs, smaller pull-off than Diablo.
- mile 96.6
Rainy Pass
4,855 ft pass with PCT crossing — trailhead parking and toilets, last big stop before the Washington Pass climb.
- mile 103.1
Washington Pass Overlook
5,477 ft hairpin around Liberty Bell Mountain — short paved loop trail to the cliff-edge overlook with the iconic hairpin shot.
- mile 118.2
Mazama, WA
Eastern Methow Valley village — fuel, the legendary Mazama Store cinnamon rolls, and lodging.
- mile 131.6
Winthrop, WA
Old West-themed Methow Valley town — restaurants, fuel, and the easy bailout south on WA-153 or east on the long WA-20 run to Tonasket.
// Why this road
The case for WA-20 is simple: no other paved road in Washington puts you this deep into true alpine terrain. From the wet western slope you climb through old-growth cedar and fir, then the geology shifts abruptly at the crest — the east side drops into a rain shadow, the rock goes from mossy to bare granite, and the light changes with it.
Washington Pass sits at 5,477 ft with the Liberty Bell group of spires rising directly above the overlook. It's worth stopping there even if you've seen a hundred mountain passes, because the scale is unusual — near-vertical walls on both sides and a tight descent into the Methow Valley. Diablo Lake, fed by glacial meltwater, runs a genuine turquoise that reads as artificial until you understand the rock flour suspension causing it.
The riding is varied. West of the pass you get long, moderate curves with limited sightlines due to forest. The pass itself involves switchbacks with off-camber sections and some patchy pavement from freeze-thaw cycles. East of the pass the road opens into wider sweepers as the valley broadens toward Mazama and Winthrop.
Traffic is real on summer weekends, particularly RVs and slow-moving sightseers near the overlooks. Passing opportunities are limited through the core stretch. Deer and black bear crossings are common, especially at dawn and dusk.
Before you go: The highway closes at the pass typically from mid-November through late April, sometimes into May depending on snowpack — check WSDOT's current conditions before committing to a crossing. Cell service drops out between Marblemount and Mazama. Fuel in Marblemount heading east, or Mazama/Winthrop heading west — there's nothing in between. If weather is moving in from the west, the pass can go from clear to socked-in quickly; the temperature drop at elevation is sharper than the valley forecast suggests.