Notice the rare headlight lens. I believe they used these for a short time in 1921.
At first I wondered why they'd be using a ferry with a bridge right there. Then I realized it's probably a railroad bridge.
Way awesome picture
Well, that car certainty has all the features to be a 1921 model.
The radiator cap is after market. It is hard to see the radiator core but could possibly be cellular. If so that shell could have something other than the ford script on it. The lack of clarity has me wondering. Are those headlight lenses turned slightly or is that how they are supposed to be?
There is a classic photo where Henry himself stands in front of a '21 Centerdoor sedan, the lens orientation should be correct on that one
Definitely a RR bridge. The center span is balanced on the center pier so the entire center span can pivot 90 degrees to allow for passage of river traffic. Note the operators cabin half way up the span.
You're correct in saying it pivots 90 degrees to allow passage of river traffic, but that does not necessarily make it a railroad bridge. I specifically know of (and have driven a cross many times) an automobile bridge that works this way on California Highway 12 between Rio Vista, CA and Lodi, CA. It crosses the Mokelumne River.
Actually,there are two of those bridges on Hwy 12, one is from the 1930s, the other from the 1990s and it's hard to figure out what it is when you drive over it. When you go under it (in a boat) you can tell though.