Due to the harmless nature of SCP-XXXX, only minimal security is required.
You don't need "harmless" here. One, the anomaly isn't actually harmless, it's just like that if no one is there. Two, it's made redundant by the "minimal security" bit required.
SCP-XXXX has the appearance of a decrepit suspension bridge.
So it's not a decrepit suspension bridge? It's a human who can make themselves look like one? Considering that the answer is "No, it IS a decrepit suspension bridge", you're gonna want to get rid of "appearance" and say "SCP-XXXX is a worn-down suspension bridge".
Attempts to reach the other side of SCP-XXXX have ended with failure.
You already mention this before when saying "The far side of SCP-XXXX is impossible to reach due to its anomalous effects" and there's no real reason I can see for the repetition.
It is believed that this is caused by a type of time loop, forcing the subject to travel through the exact same point indefinitely until reversing direction.
That's a bit of a jump. How does the Foundation know this. Did they perform tests in order to figure this out? Or what? I'm not sure. What about helicopters or drones? Do they go to the sides or diagonally beyond the bridge? Actually, you never even reveal the location of where this is. For all I know, it could be in some deep underground temple or whatever (which would be pretty likely).
This is a very incomplete article, and I'm not sure what you're supposed to be doing with this, or what kind of story you want to tell or what emotions you want to have the reader feel. This is so bare-bones, and there's a number of ways this could go. You don't have something that'd immediately compel the reader to want to keep reading or find out what this is. It just goes through the motions without attracting the reader to any one idea or possibility. It's not that interesting of an idea, at its core, so you need to be inventive and explore what you're trying to aim for. Focusing on the fog and what's likely to be there (or not) is one of many possible avenues. Keep working on it, build the article, tell what kind of story you want to tell, though the idea might not exactly be the most solid of a foundation to work with.