Update — Sunday, February 21, 5:54 a.m.: Construction has ended.

For the past few months, the TTC has been working to replace its aging underground storm pump infrastructure near

• Yonge Street, just south of Sherwood Avenue.

Storm pumps help keep rain and storm-water from flooding the subway system.

TTC crews successfully replaced the storm pump in December. Now, they’ll replace a discharge pipe. The pipe clears water at track level, so that trains can keep moving along the 1 Yonge - University line between Lawrence and Eglinton stations.

They’re digging up the east side of Yonge Street to replace the pipe, which is about three metres (10 feet) underground. The crews may temporarily block traffic lanes lane, but one lane of traffic in each direction between Briar Hill and St. Clements Avenues will be available to motorists. They’ll also restrict access to vehicles entering or exiting from Sherwood Avenue at Yonge Street.

The City of Toronto will temporarily prohibit parking on the east and west sides of Yonge. According to the TTC, crews will work “around-the-clock” to make sure they finish as soon as possible.

The work may delay passengers riding TTC buses along the 97 Yonge and 320 Yonge overnight routes in the area.