SAN DIEGO (CNS) - Overnight work on a sewer line has state Route 163 closed through Balboa Park, with the road set to reopen about 5 a.m. Sunday, Monday and Tuesday.

Southbound lanes from Interstate 8 to A Street also will be closed, reopening about the same time.

Detour signs are posted.

Crews are relining a trunk line with a system expected to extend the life of the 45-year-old sewer line by about 50 years and save taxpayers some $17 million.