Hi
This is an update.  Two weeks ago I saw a Prothonotary Warbler at the Coon Rapids Dam on the Hennepin county side. I went down there this morning and found two of them still there in the same area.  I got a couple of photos that are not the best but they are proof that a bird is still there.  This was the bird that Adam Roesch first spotted.  I am hoping that they are nesting there but I could not see any cavity in use though someone had pointed out to me where it was likely to be.  Here is a photo
https://www.flickr.com/photos/ronsthoughts/ <https://www.flickr.com/photos/ronsthoughts/>
Ron Taube
Coon Rapids