The Iron Bridge in Marilla is on Clinton in Marilla and is over Cayuga Creek. I have an aunt and uncle that live about 500-100 ft from it. Just past is the county line. There were more than a few deaths from kids jumping in the creek from the bridge There was a deep pool (20-30 ft deep), but right next to it, it was only 1-2 ft deep. You could sit in the creek and let your feet dangle over the underwater ledge. They filled it in and also cut down all the big old trees so kids couldn't tie ropes to them.
In Cheek towaga, Cayuga Creek was about 700-800 ft across the street. The last time it really flooded bad was in 72 when Hurricane Agnes(?) stalled over the Southern Tier. William and Union had about 2 feet of water (I know- I was a stupid teenager that walked through it). After that, the Corps of Engineers worked on the area just east of Unin Road and it hasn't flooded since.
I believe the headwaters of the creek may be in Cuba, NY.