I am assuming its just lighting in the image you guys are looking at. Unless someone set fire to the deck I didn't see anything last time I was there, a year or two ago, that would indicate the deck was about to fall into the river. As I recall a tree falling had dinged the end post a little, but no major changes or concerns were noted during that visit. The road commission removed the builder plaques a few years ago and told me that they are keeping them in storage at the county road commission office.
I'm looking at it and it could be shadowing or where two images have been spliced together.
Looking at this on satellite, it looks like about half the deck has fallen away...!
It appears this may be headed for a second life.
Last year, the County green-lit an engineering feasibility and cost study with regards to having this bridge restored.
https://www.shiawassee.net/Docs/BOC/Board%20Minutes/2019%20B...
The purpose? For use as part of a biking trail.
https://www.shiawassee.net/Docs/Parks-Rec/Parks%20Plan%20Add... (Page 7)
https://www.nrtdatabase.org/trailDocuments/3997_61_Water_Tra... (Page 28)
Consulting party? (Or quite possibly the ones doing the study.) Nels Raynor, and therefore Bach Steel as well.
http://www.shiawasseeroads.com/v3.0/05-28-19%20Minutes.pdf
The Argus-Press (an Owosso newspaper) mentions that a "pocket park" has also been proposed for building around the bridge - unfortunately, the full article is behind a paywall.
No news since then, however.