Well, the question at this point is not whether it's important enough to have a file on it in-universe (it's clearly anomalous, so no problem there); it's why it's important enough to ask people to read it out of universe. So what you need is something to make it pay off emotionally, and there are only so many ways people usually do that.
If you want to pay it off with disgust, you can add squicky details.
For sadness, imply some kind of tragic, tear-jerky back story. (Most people will be assuming something about a man/woman/boy/girl and his/r dog. So don't do that.)
I have no idea how it could be done in this case, but making it funny, somehow, is always an option.
You could probably reach surprise by adding some kind of unrelated-looking secondary effect and then show how it's actually not unrelated at all: that's hard to do, but it seems like a lot of the more popular squicky SCPs are popular not because they're gross, but because they do something unexpected in addition to being disgusting. Obviously it has to be a surprise that's supported by the part of the story you've already got; otherwise you may as well just say "and then a skeleton jumped out."
(Wouldn't recommend aiming to induce anger in the reader, but if you want to, redact every third word of what you've already got and toss it up on the main page.)
Whatever way you end up going, what's going to make it memorable are the details, so if you're having trouble deciding or aren't feeling inspired, maybe think about those. What does the area underneath the bridge look like? Do people/dogs jump in a particular, very specific, way? What time of day is it when they jump? What's the weather like? What would an observer see if they watched a film of a jump? What does the bridge even stretch over? Etc.