A northbound lane of Aurora Avenue in the South Lake Union area will remain closed for up to two more weeks, leading to more delays, while crews repair a broken sewer line.

Seattle Public Utilities have been working on the sewer line since Monday after crews discovered a blockage and sewage overflow on Nov. 13, closing a northbound and southbound lane between Ward and Comstock Streets.

All southbound lanes are open, but at least one southbound lane may close on any day after 7 p.m. depending on the work progress.

SPU crews expected to finish work by Friday night, but workers discovered a collapsed section of pipe with grout and sludge, revealing a bigger project at hand, according to the agency.

The sewer line is more than 50 percent block, causing sewage to overflow. Crews have been installing pump and bypass equipment in the center lanes of Aurora Avenue.

Workers will excavate and replace the existing pipe.