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The Cone Zone

Below is information regarding lane closures and detours impacting the City of Thornton.

I-25 Night Closure

On 1/20/2020, all lanes of northbound I-25 will be closed between 120th Avenue and 136th Avenue starting at 10:00 PM. The lanes will reopen at 4:00 AM the following morning.

The detour route for the northbound closure is to exit I-25 at 120th Avenue, go east on 120th Avenue to Washington Street, go north on Washington Street to 136th Avenue, go west on 136th Avenue to reenter northbound I-25.

The closures are part of the Colorado Department of Transportation's North I-25 Express Lanes Project. For more information please visit the project website at

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