This is the current (second) bridge built in 1962.
BH Photo #157105
If I had to guess the title of "Oldest Cantilever" is intended to mean oldest cantilever still carrying vechicular traffic.
Caption for photo #3 is incorrect, as the Wenatchee Bridge is a cantilever bridge in the state that is older.
The construction video was on the Grant County website, hope there is some way to retreive it.
There was recently a construction video of the two bridges on the WA site but it is now gone. I would like to find it again.