Sections of the Schuylkill River Trail and Martin Luther King Jr. Drive will be closed for about six weeks so a wall along the river can be rebuilt.
The closures started Dec. 6 and run through Jan. 20, according to the Department of Parks and Recreation.
During that time, the Schuylkill trail between Franklin's Paine Skatepark and Race Street will be closed entirely.
Pedestrians and cyclists on the trail are being detoured from the skate park through Eakins Oval to 22nd Street, then on 22nd to Race Street, where they can reenter the trail.
At some times, MLK's eastbound (inbound) lane between Sweetbriar and Eakins Oval will also be closed.
That closure will be in place from 9 a.m. to 3 p.m. and from 7 p.m. to 5 a.m.
Initial information indicated the Schuylkill path would also only be closed during certain periods, but the city said this week that the trail would be closed at all times during the construction.
The work is necessary because a 75-foot section of the wall fell into the river in August, causing part of the retained soil supported by the wall and asphalt walkway to collapse into the river, the department said. So the wall needs to rebuilt to prevent more sections of the wall and soil from failing.