The website link below confirms what Nick posted. Looks like coming up the 38 from Mentone, the 38 is closed at Mill Creek Rd which is just past the fire station in Angelus Oaks.
Type in “Hwy 38” and click search and it will come up with the details.
[IN THE SOUTHERN CALIFORNIA AREA]
IS CLOSED FROM MILL CREEK RD /IN ANGELUS OAKS/ TO 5.2 MI EAST OF AANGELUS OAKS /AT JENKS LAKE RD/ (SAN BERNARDINO CO) – DUE TO A MUDSLIDE – MOTORISTS ARE ADVISED TO USE AN ALTERNATE ROUTE – RESIDENTS WITH PROPER IDENTIFICATION WILL BE ALLOWED ACCESS