UPDATED 4:35 p.m.: The westbound lane of Highway 92 remains closed after road crews discovered a "dip" that could grow into a sinkhole. Caltrans said one-way traffic control was in effect on the major artery to the coast in time for the evening commute.
The trouble is west of upper Highway 35. The road was initially closed in both directions this morning as Caltrans evaluated trouble. By early afternoon, the San Mateo County Sheriff's Office tweeted that the eastbound lane, separated by a k-rail divider, was open but to expect delays.
There was no word on when the problem would be rectified. Caltrans has been at the scene since midmorning evaluating the dip, according to CHP Redwood City spokesman Art Montiel.
"It's believed that with the unstable ground underneath, if vehicles drive over it, it could become a sinkhole and that's why we've closed the road," Montiel said.
Highway 92 has held up rather well since the second round of rain began on Jan. 4. There has been minor ponding on the road and in the shoulders. It did close for a time on New Year's Eve when flooding of the Pilarcitos Creek spilled over onto the roadway.
There has been another obvious area of concern since then that the state transportation agency had temporarily fortified with sandbags and a tarp. It is near the lower lake area, on the shoulder of the westbound lane. The pavement broke away sometime last week and washed down the hill and appeared in need of repair. The area has been marked with traffic cones for several days.