Mountains to Sound Greenway - I-90
National Scenic Byway 99 mi in Washington.
About the Mountains to Sound Greenway - I-90
Drive east from Seattle on I-90 through pastoral valleys, lush forests and a dramatic mountain landscape. Visit historic towns and scenic spots for forest walks or challenging hikes. Cross the Cascades into a drier climate where coal mining built pioneer towns on the way to the Columbia River.
Federal Highway Administration, America's Byways's own description, in its words. Byway page on America's Byways.
Designations: National Scenic Byway, Washington State Scenic Byway.
Camping along the byway
- Mile 14 · 0.7 mi offLake Sammamish State Park · State park · reservable
- Mile 42 · on the roadTinkham Campground · Forest Service · 51 sites · reservable
- Mile 49 · on the roadDenny Creek Campground · Forest Service · 43 sites · reservable
- Mile 60 · on the roadCrystal Springs Campground · Forest Service
- Mile 60 · 4.4 mi offKachess · Forest Service · 149 sites · reservable
- Mile 66 · 3.1 mi offEast Kachess Group Site · Forest Service · 1 sites · reservable
- Mile 68 · 0.7 mi offLake Easton State Park · State park · reservable
- Mile 73 · 4.7 mi offWish Poosh Campground · Forest Service · 34 sites · reservable
- Mile 86 · 3.8 mi offIcewater Creek Campground · Forest Service · 4 sites · reservable
- Mile 91 · 2.7 mi offTaneum Cabin · Forest Service · 1 sites · reservable
Public campgrounds within 5 miles of the road as the crow flies, in order along the byway; each one's page has its facts, season and weather by month.
About this page's facts
The line is the Federal Highway Administration's scenic byways layer (HEPGIS, a snapshot of 2022-06-24, a US government work), cut at the state line and simplified for the map; the length is the line's. The designation is the program's own: the national tiers from FHWA's America's Byways roster, the rest from the layer's designation field. Road conditions, closures and seasonal gates change: check the agency's own page and the state's road conditions before you go.