A quarter-mile-long brush fire along northbound I-5 north of Lynnwood triggered major delays Monday afternoon.

Flames were first reported just after 2:30 p.m.

Large plumes of smoke lingered over the highway for much of the evening commute, causing a 14-mile backup that stretched to Seattle’s University District. Northbound travel times approached two hours.

Multiple lanes were blocked as fire crews put out the flames. The smoke was also a distraction in the southbound direction.

The fire was under control by about 4 p.m. and all lanes reopened by 5:30 p.m. The cause is under investigation.