What was "fun" about that bridge was that, in pre I-5 days, the junction of CA 16 and CA 99 & 70 (the latter on Jibboom Street and formerly SSR 24) was right at the east end of the bridge; the traffic level using both the bridge and that intersection, at least in the mid-60's, was high enough that the eastbound backup went over the bridge and down the west approach into West Sacramento. Since the bridge couldn't be opened if there were any vehicles on the swing span (automotive or rail [on the lower deck]), over-height vessels would simple have to wait until things cleared out -- effectively meaning that during commute times (this was the major route from Sacramento to Woodland and northerly points on old US 99W) the bridge just couldn't be opened. I've been on that bridge when a train passed underneath; it always seemed like the old structure would just shake itself apart! But it was built to handle the weight of SP's largest articulated steam locomotives (the 4-8-8-2 AC-class cab-forwards), so despite the vibrations to the contrary, the structure will likely continue to be used as a rail facility for some time to come. But for cross-river car & truck traffic, it's the end of an era!