The coopers are definitely nesting near their old nest in Riverwood, and I think they might reuse the nest. I saw the male breaking a branch about 50 m SE of the old nest, and 5 seconds later the female flew in cackling (I saw her 40 minutes before at the main parking lot). Unfortunately, a red-tail then flew over, the birds froze, and didn't move again, even when I left for 10 minutes and came back.
Other bird today included the swamp and 2 white-throated sparrows, red-bellied woodpecker
also a chickadee excavating a nest hole
When is it going to warm up... should be seeing tree swallows, phoebes, fox sparrows, toads, snakes by now... I haven't even seen a flicker yet!