PLACER COUNTY (CBS13) — A crash has eastbound Interstate 80 lanes closed heading up the Sierra on Friday.

The crash happened just after 11 a.m. at Drum Forebay.

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Exactly what led up to the crash is unclear, but several vehicles and a semi-truck were apparently involved.

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Caltrans has sent out a traffic alert that all eastbound lanes are now closed 2.1 miles east of Baxter due to the crash. A detour is in place and drivers are being urged to use an alternate route.

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No estimated time of reopening has been given.