Since the OP/thread title concerns CA 99, this -- despite the 4+ month layoff, is where this news belongs:
Of the four original "over/under" RR crossings (one direction goes under the tracks on the original 2-lane underpass while the other direction, added later, bridges over the tracks) that CA 99 inherited from US 99 at the time the shields were swapped in mid-'66, two were gone by the mid-80's (south of CA 46/Famoso and the CA 198 interchange near Goshen) with two remaining: Chowchilla and Elk Grove. Well, it'll be down to one by the end of 2020; the crossing south of Grant Line Road in Elk Grove is being reconstructed as double bridges, with the SB underpass (which featured a low 14'5" clearance) bypassed by a new bridge adjacent to the existing NB bridge; at this point, the berms are being constructed with the actual bridge to follow. Also, the NB 2-lane bridge is being widened to accommodate shoulders (the new SB bridge will be able to accommodate 3 lanes+ shoulders). However, there are no immediate plans to widen or replace the series of older bridges immediately to the south crossing the Consumnes River floodplain. Several miles to the south, the section through Galt has been rebuilt with some new bridges (the old CA 104 interchange remains the same, however); but the interim section, about 5-6 miles, will remain the same for the time being. But the most egregious substandard structure (the old underpass) will be history.