IRWINDALE (CBSLA.com) — A slow-burning fire continued to burn Wednesday morning in a stories-high pile of compost in Irwindale.

It was first reported around 7:20 p.m. Tuesday at Cal Blend Soils in the 1200 block of East Arrow Highway, according to the Los Angeles County Fire Department.

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The blaze has prompted authorities to close the nearby Arrow Highway onramp to the northbound 605 Freeway. It’s unclear when it will reopen.

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Meanwhile, crews are turning over compost to try and get to the flames deep-seated within the pile.

Residents across the San Gabriel Valley say they can smell the smoke.

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