HAVERHILL (CBS) – Traffic in Haverhill was snarled for several hours after concrete came loose in the center lane of a bridge on Interstate 495.

The crumbling concrete exposed a 6-inch area of steel reinforcement bars on the bridge, which is above the Merrimack River in the area of Exit 49.

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Traffic delays resulted from a hole in a Haverhill bridge on Interstate 495. (WBZ-TV)

Traffic delays resulted from a hole in a Haverhill bridge on Interstate 495. (WBZ-TV)

Crews began working in the area Friday morning and only one lane of traffic was getting by on the southbound side of I-495.

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Traffic backed up due to a hole in a Haverhill bridge. (WBZ-TV)

Traffic backed up due to a hole in a Haverhill bridge. (WBZ-TV)

An area of concrete was removed from the bridge and new concrete was poured near the expansion joint.

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All lanes were reopened by 4:50 p.m.