Sinkhole keeps Modesto Highway 99 on-ramp closed for second day
A closure prompted by a sinkhole along the side of a Modesto freeway on-ramp is stretching into a second day.
California Highway Patrol announced the closure Monday morning. The sinkhole is on the Highway 99 on-ramp from 4th Street.
***SR-99 ON-RAMP FROM 4th STREET***
— CHP Modesto (@chp_modesto) March 23, 2026
There is a sinkhole on the on-ramp. The on-ramp will be closed for an extended period of time. No estimated time for re-opening. pic.twitter.com/GXhOevWkOU
It's unclear what is causing the sinkhole, but the on-ramp will be closed for the time being as crews work on a fix.
No estimated time of reopening has been given so far, CHP says. Drivers will have to detour around the closure by using the next on-ramp.
As of Tuesday, the on-ramp remains closed as Caltrans crews continue work on fixing the sinkhole.