Three sites are open: two Hwy in Tulare, CA (S.R. 99 ex. 88, 3/1/0); Santa Clarita, CA. (Jct. I-5, ex. 172/S.R. 126, 5/1/0). Also 1 urban site in Belmont, CA.
Tulare provides access to Sequoia N.P from the south, as well as travel along 99; it's 66 miles south to the EA site in Bakersfield on 99, and just 31 to the site in Selma to the north, with a couple of Fresno urban sites and the Madera Hwy one in reach beyond that; Turlock is a bit far (127 miles) but doable in most conditions.
Santa Clarita's exit is two miles north of Magic Mountain Parkway, and it's 76 miles to either of the two EA sites in Bakersfield.
Although listed as open, Belmont is currently showing on the map as being in the LA area instead of the Bay Area, which may be why I couldn't find it
I've sent them an email.