Some lanes of southbound State Route 163 at Clairemont Mesa Boulevard were closed on Thursday for several hours after a semi-truck hit the underside of the overpass, sending concrete pieces falling down onto the freeway below, Caltrans said.
California Highway Patrol closed the right two lanes of southbound SR-163 at Clairemont Mesa Boulevard in Kearny Mesa around noon and alerted the public to expect delays in the area. By about 11 p.m., all lanes had reopened.
It has not been confirmed if debris was still falling off the overpass by the time lanes were reopened.
⚠️TRAFFIC ALERT⚠️
The right two lanes of 163 south at Clairemont Mesa Blvd are blocked to remove debris after a semi struck the underside of the Clairemont Mesa over crossing. pic.twitter.com/AOLP3leERS
— Caltrans District 11 (@SDCaltrans) October 22, 2026
Photos from CHP San Diego show bits the overpass littering the two shut-down lanes. Another photo shows Caltrans crews assessing the damaged overpass, which shows exposed wires underneath the overpass.
🚧TRAFFIC ADVISORY 🚧
As of 3:45 p.m., on 10/22/26,
The two right lanes of State Route 163 Southbound at Clairemont Mesa Boulevard will be closed for an unknown duration. Please expect delays in the area. pic.twitter.com/TYzEPtqX1l
— California Highway Patrol San Diego (@CHP_San_Diego) October 22, 2026
🚧TRAFFIC ADVISORY 🚧
As of 4:15 p.m., on 10/22/26, The two right lanes of State Route 163 Southbound at Clairemont Mesa Boulevard will be closed for an unknown duration. Please expect delays in the area. pic.twitter.com/CfDQp2wI0r
— California Highway Patrol San Diego (@CHP_San_Diego) October 22, 2026
No other details were immediately available.