Why Does Great Miami River Smell?

Not sure if I’m just now noticing it but I’ve lived in Dayton my whole life but never this close to the river and just recently have started to smell a really strong sewage smell by the river between west third street and stewart. Is this normal? I’ve been biking on the bike path by the river for 8 years and have never noticed the sewage smell this strong before. Usually it just smells like river and goose poop.