Darn Larry you beat me to it. Trish just contacted me on the Facebook page. Here is the info from Caltrans:
SR 74
[IN THE SOUTHERN CALIFORNIA AREA]
IS CLOSED FROM 3.8 MI EAST OF SAN JUAN CAPISTRANO (ORANGE CO) TO GRAND AVE /IN LAKE ELSINORE/ (RIVERSIDE CO) – DUE TO A SINKHOLE – MOTORISTS ARE ADVISED TO USE AN ALTERNATE ROUTE – RESIDENTS WILL BE PERMITTED WITH PROPER IDENTIFICATION