Three months of detours for traffic along Interstate 69 at the San Jacinto River are coming to a close.

Officials with the Texas Department of Transportation said Wednesday that following a flurry of weekend closings, southbound traffic will shift by Monday morning to the new bridge, built to replace the one damaged by heavy river flows during Tropical Storm Harvey and its aftermath. Northbound traffic will return to normal after weekend closings starting June 29.

“The goal was to get this done as quickly as possible and get it opened back up,” said TxDOT spokesman Danny Perez.

Progress, however, comes with a bit of work left to do, which will come with some lane restrictions starting Friday. Crews will close all but one of the southbound main lanes from FM 1314 to FM 1960 between 9 p.m. Friday and 5 a.m. Monday. Entrances and exits from the southbound freeway to Sorters McClellan/Townsen will be closed from Friday night to 6 p.m. Saturday.

Surging waters shifted the river’s channel and walloped the southbound span’s supports, scouring away much of the material at the base of the pillars. Though the bridge was deemed safe for cars as officials awaited a full replacement, heavy trucks were detoured to the frontage road.

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Work started by temporarily shifting traffic March 9, before entirely closing the bridge two weeks later. Since then, southbound traffic has been sharing the northbound lanes from south of Kingwood Drive, across the bridge, before transitioning back the other side of the freeway near Townsen. Having only two lanes in each direction has led to some delays in both directions.

Completion of the $7.5 million project was expected to take three to six months. Perez said Webber LLC, the contractor, will receive a $500,000 incentive bonus for finishing earlier than allotted by the terms of the contract.

Dug Begley writes about transportation for the Chronicle. Follow him on Twitter at @DugBegley and Facebook at @PoppedClutchCity. Send him tips at dug.begley@chron.com