Saw one flying over an intersection in suburban Colorado just last weekend. I had seen them "in the wild" before (e.g. while river rafting in PA) but it was interesting to see one while I was just out running errands.
There’s a nest and nesting pair you can see really clearly from the wildlife viewing area at Barr Lake State Park, about a mile and a half from the parking lot. Helps to have a telephoto lens or decent pair of binoculars, although when I was there a few weeks ago there were several just hanging out in trees right next to trails.