KPHO.com - 2/19/13, Steve Stout

(Source: Arizona Department of Transportation) A 150-foot section of U.S. 89 about 25 miles south of Page collapsed early Wednesday morning.

PHOENIX (CBS5) - A 150-foot section of U.S. 89 south of Page that buckled and sunk four feet Wednesday might have been caused by a "geologic event," according to the Arizona Department of Transportation.

The road collapsed at mile post 526 just 2.5 miles north of the intersection with U.S. 89A, about 25 miles south of page, according to an ADOT spokesman. He said the incident was not related to the weather.

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