Tapes of alarm calls or other disruptions would have to be used each night. It is likely that the birds would eventually find an area for their roost that would be agreeable to both them and the human population of Auburn, preferably some woodlot out of town. Best of luck in your efforts to deal with this problem. And take heart. It will go away on its own in about a month or a month and a half.
Large roosts are a winter phenomenon only.
They will break up as breeding begins in mid or late March. They will, however, start up again next fall. Much of the information in this letter has been provided to me by Kevin McGowan, Associate Curator of Birds and Mammals from the Department of Ecology and Systematics at Cornell University. Kevin is a crow expert who has studied crow behavior and population biology for approximately 10 years. The presence of large crow roosts in the Auburn area is not a new development or phenomenon.