Looks like Carquinez Scenic Drive between Crockett and Martinez will be out of commission for a year, starting in June, as the East Bay Regional Parks District repairs and upgrades it into an official part of the Bay Trail network:
Please note that they will be "actively citing violators" who use it during the closure. The alternate route between Crockett and Martinez will be Carquinez Scenic Drive to McEwen Rd to Franklin Canyon Rd to Alhambra.
-Robert Prinz