Carbon Canyon Road Closed in Brea Due to Mud Slide

With the heavy rain, saturated soil and history of issues in this part of Carbon Canyon, it is no surprise to learn of this just now from the City of Chino Hills:

Carbon Canyon Road Closed - Long-Term Closure Expected

12/26/2025 - 12:14 PM PST

Carbon Canyon Road (State Route 142) is closed at Olinda Place due to a mudslide on the City of Brea side of the roadway. This is expected to be a long-term closure while Caltrans responds and conducts cleanup operations.

Residents who live in Carbon Canyon may access their homes from the City of Chino Hills side via Chino Hills Parkway. There is no access to Chino Hills via Carbon Canyon from the City of Brea side. Updates will be provided as the road reopens.

UPDATE, 3:15 P.M.:

Major Road Alert

12/26/2025 - 3:12 PM PST

UPDATE: Carbon Canyon Road (State Route 142) has reopened.

Carbon Canyon Road Closed Due to Mudslides

UPDATE, 3:40 p.m.  Literally got home ten minutes ago and am now hearing the first flow of cars heading eastbound on Carbon Canyon Road, which is now completely open.

8:50 a.m., 24 January:   Chino Hills has not updated its alert, but the Brea hotline was updated a few minutes ago and says the road is closed with no clear path to Chino Hills and that CalTrans states the road might possibly be open at Noon.  Yet, for nearly two hours cars have been heading west, though with long delays.  A long line of westbound vehicles is stopped here in Sleepy Hollow, but cars have been going through for about two hours, though very slowly.

7 a.m., 24 January:  Though there have been no updates from Brea or Chino Hills, a long line of cars is making its way west on Carbon Canyon Road, which appears to indicate the road is open, though perhaps not both lanes.

UPDATE, 8:10 p.m., 23 January.  A half-hour ago, a new update came out, now posted by both Brea and Chino Hills that CalTrans has revised its estimate for reopenng Carbon Canyon Road from 6 a.m. to Noon.

UPDATE, 5:40 p.m., 23 January.  The City of Brea updated its Carbon Canyon hotline an hour ago.  Residents of Olinda Village and the Hollydale mobile home park will be escorted to their homes tonight by CalTrans personnel, but will then have to "shelter in place" (that is, stay put) until the work is completed to reopen Carbon Canyon Road.

CalTrans estimates the state highway will be open by 6 a.m. tomorrow morning and it hopes to do so sooner.

4:30 p.m., 23 January.  The City of Chino Hills alert system was last updated at 1 p.m. and there was no news.  Carbon Canyon Road remains closed while repairs on the mud slide and downed power pole continue.

UPDATE, 23 January, 5:50 a.m.  An alert update almost an hour ago informs that Carbon Canyon Road remains closed from the county line to Santa Fe Road.

UPDATE, 11:05 p.m.:  Carbon Canyon Road will remain closed through the night with no given timetable for reopening.  Olinda Village residents can access their homes from Santa Fe Road eastward with a police escort only.

Not surprisingly, with the heavy downpours all day today, Carbon Canyon Road has been closed between Santa Fe Road and Olinda Village, where the uphill climb eastward passes the steep slopes of the hills.

Mud slides and a downed power pole are involved, according to notices posted just moments ago on the Brea phone hotline and the Chino Hills website.  More information will be posted when available.