US-421 will be closed 2.99 Miles North of State Road 250 near Thornton Road. Alternate routes are Hwy 7 to Hwy 50 or other routes that will get you north

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(Jefferson, Co.) - US-421 will be closed 2.99 Miles North of State Road 250 near Thornton Road. The roadway will be closed in both directions from March 24th through April 22nd, 2025, while a culvert is being replaced.
Detour signs will be posted.

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