As a young child in the 1960's my school bus crossed the Prowers Bridge twice a day on the way to and the way back from school in the little town of McClave, Colorado. The bridge was one lane and seemed very rickety and scary but still survived the great floods of 1921 and 1965.
My Grandparents lived in Prowers, CO in 1903-1905, they had relation in Granada,CO, Kansas, and Rocky Ford, CO so I can just imagine them going across the Prowers Bridge many times in a horse and buggy.