Lost black iPhone 12 with gray speckled case near Riverside Park, Inland Empire.

I'm really hoping someone can help me recover my black iPhone 12 that I lost while walking my dog near Riverside Park in the Inland Empire. I remember having it with me when I stopped to rest on a bench, but after that, it just slipped my mind. It has a gray speckled case and a few pictures of my family on it that are really special to me.