The authorities can try to lock down a place, but public curiosity must be satisfied. Thus, people will have a four-hour window on Saturday to look at the Eggner's Ferry Bridge. I'm guessing they will have to open up the area more eventually. If nothing else, people will want to see it from the river and from other angles. You can't stop people from looking at something like this.
And here's some on-the-scene video from a couple of days ago.