I used to ride the Wheatland ferry as a shortcut into Salem sometimes growing up. I don't remember if the version I rode was electric, but apparently the most recent version has been de-electrified:
> "This most recent ferry differs from its predecessors in that it has a capacity of nine cars, rather than the six Daniel Matheny IV carried, and it has its own self-contained diesel-electric generator. As its source of electricity is now an onboard generator, the current ferry is no longer reliant on electricity from overhead wires. The overhead cable serves the sole purpose of bracing the ferry against the current."
> "This most recent ferry differs from its predecessors in that it has a capacity of nine cars, rather than the six Daniel Matheny IV carried, and it has its own self-contained diesel-electric generator. As its source of electricity is now an onboard generator, the current ferry is no longer reliant on electricity from overhead wires. The overhead cable serves the sole purpose of bracing the ferry against the current."
https://en.wikipedia.org/wiki/Wheatland_Ferry