The Mill Dam Bridge carries Mill Dam Road across the tidal mudflat of Centerport Harbor[1] on the North Shore of Long Island, in Centerport, Suffolk County, New York.

It divides the navigable waters of the harbor from the Mill Pond formed by its tidegates.

[5] The bridge was closed to traffic in October 2007, due to deterioration of the old causeway connecting the new span to the shore.

In February 2008, workers making repairs to the causeway unearthed a 3000 pound (1400 kilogram) gear, believed to have been installed at the tide mill during an 1848 overhaul.

In 2001, the town of Huntington, New York opened the Grist Mill Park on a plot adjacent to the west end of Mill Dam Bridge, the site of the former Rockhopper's restaurant, and Vengroff, Williams, & Associates Collection Agency, severely damaged during a fire a few years earlier.