Probably because there is more traffic on the US 67 bridge. This bridge I guess was never paid any attention too. Instead they need to cross the river by using the US 67 bridge which is much faster.
Seems to still be in fair condition, why did they close it?
i heard ppl get arrested for being on this bridge althought their arent any signs telling u to stay off of it lots of brush and bees and such to get to it, but if u make it, its pretty cool, a 4 wheeler would be good