The Bucksport mill seen from the boat launch on Verona Island.

Bucksport’s skyline changed for good Tuesday when the main smoke stack at the defunct paper mill came down.

The smoke stack came down shortly before 8 a.m.

Bucksport police closed Main Street from 7 to 8 a.m. between Third and Main streets, and a spot near the old mill entrance, where Main Street becomes Route 15. Police also kept spectators off the Bucksport Waterfront Walkway.

The razing of the smoke stack is the latest change to happen at the mill site, as a company that owns about 100 acres prepares to break ground next year on a land-based Atlantic salmon farm and Maine Maritime Academy plans a new continuing education annex on former mill property.