See I-90 right now — live DOT cameras and real-time conditions along America's longest interstate, from Seattle to Boston, each tagged with its mile marker. Snoqualmie Pass, the northern plains, and the Great Lakes snow belt, all on one map.
Seattle to Boston · the longest interstate. Here's what to watch, and where the weather actually bites.
At about 3,020 miles, I-90 is the longest interstate highway in the United States — a continuous route across the northern tier from Seattle to Boston. It climbs the Cascades at Snoqualmie Pass, crosses Montana and the Dakotas, threads the Great Lakes states, and runs the width of New York.
Three trouble zones dominate I-90 in winter: Snoqualmie Pass in Washington, where avalanche control and heavy snow close the highway several times a season; the open northern plains of Montana and South Dakota, where ground blizzards and wind drop visibility to nothing; and the Great Lakes snow belt from Wisconsin through Ohio and western New York, where lake-effect bands can bury a stretch in hours.
The cameras and alerts above are the stationary view — the DOT feeds you'd check before you leave. In the MileCheck app, your exact mile marker and the nearest camera follow you the whole way, hands-free on CarPlay and Android Auto.
The live map above shows active closures and incidents along I-90, straight from each state DOT; a red banner appears at the top of this page if a stretch is fully closed. For a full US view, see the road closures map. The most common winter closures are at Snoqualmie Pass and across the northern plains.
About 3,020 miles from Seattle to Boston — the longest interstate highway in the country.
The big one is Snoqualmie Pass in the Washington Cascades (marked ▲ on the map). See all Western mountain pass conditions for the ones on your route.
Snoqualmie Pass, the northern plains of Montana and South Dakota, and the Great Lakes snow belt. Track your mile marker through any of it with the MileCheck app.
MileCheck shows your nearest mile marker in real time as you drive I-90, plus live DOT alerts on your route and the nearest camera. Free to start, works offline, and runs on CarPlay and Android Auto.
MileCheck