UFO Sighting in Minerva, New York

Witness states: "I was fishing with two friends at the hudson river in the adirondacks. we thought we were alone, but suddenly there was a large crowd of people in rafts coming down the river as well as a pedal-driven train tour along the railroad tracks. my friend took a picture of the crowd. we did not see anything unusual at the time, but on looking at one of the pictures later, there is a very strange image in the upper right hand corner. it appears to show a possible ring-shaped object flying over the bridge, with a jet trail or something behind it."
Source: Mufon