McAllister Reef is built on the location of the 1959 McAllister Grounds reef. The original materials have mostly disappeared. Also known as the Fishing Line reef.
28 foot steel workboat sunk Sept 28, 2000.
side-scan sonar image of McAllister Reef, click to enlargeA power plant turbine sunk in 2021
All manner of concrete, steel, and stone rubble from dredging, demolition projects, and other construction is used as artificial reef materials. This material is generally available at very low cost or free from construction companies who are more than happy to get rid of it. Transportation costs determine where this material is used by the Reef Program.