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Destinations

Mountain hubs across California.

Routes

Road conditions, restrictions, and closures.

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Is MountainSwitch working?

API Docs

Public endpoints and schemas.

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The story behind the data.

Lake Arrowhead · SR-189 road conditions

Checking current route conditions.

MountainSwitch Know before you go.

Conditions change fast. We republish official source data, so always verify with on-the-ground signs, law enforcement, and weather before you drive.