Hey PFF - my "cement pond" is here in the city, in my back yard. 'Bout the only thing is gets full of, is KIDS!
I felt sorry for that lonely LMB. She must have eaten all of her offsping and potential mates. I would occasionally go by and snag her just to see what shape she was in...last summer she got skinny during the drought so I put her in the big pond. She would strike at darn near anything.
Eric, I would have to toss in something too were it me. CC seems like a good idea (to me). You can feed them and have a little fun waiting for your pond to clear.
Gator