Crash blocks several lanes of SB I-680 in Walnut Creek, causes traffic backup

A crash has blocked several lanes of southbound I-680 at Treat Blvd. in Walnut Creek, causing significant delays for the morning commute.

WALNUT CREEK, Calif. (KGO) -- A crash blocked several lanes of southbound I-680 at Treat Blvd. in Walnut Creek, causing significant delays for the morning commute.

The lanes are now clear but delays continue.

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Crash blocks several lanes of SB 680 in Walnut Creek