Dallas Southside water treatment plant is an active municipal water treatment plant. It has several ponds at different stages of operation, some are open water and others are just sludge. Fantastic birding spot but closed to the public. A few select birders were grandfathered onto a list at the guard shack. They are allowed to bird the area and to bring a guest. I was fortunate to be a guest once. On the first little pond, we were greeted by this Canada goose.
Canada Goose (Branta Canadensis)