Black_Diamond
The ford has been marked as seasonal.

The USGS 3DEP background layer does not show anything that looks like parts of a foot bridge here. The railroad bridge next to this area is visible.

So unless there is something more definitive about who is maintaining such a bridge or what are the operating hours/dates for such a bridge (e.g. a sign or a website), it's probably best to leave this as a ford. That way people won't rely on such a bridge when it's not clear on when it's available.

From the USGS 3DEP background layer, it's also clear that many of the trails are off. Some are likely not official or non-existent, especially since some cross a railroad. Railroad companies do not like pedestrians anywhere near their active lines for liability reasons. The police generally consider it trespassing.