Grays Reef Passage, Michigan

Detroit District
Published Jan. 9, 2024

Gray's Reef Passage, Michigan is located between Gray's Reef and Vienna Shoal, in the northeasterly end of Lake Michigan, lying easterly of Beaver, Fox and Manitou Islands. The project was authorized by the Rivers and Harbors Act of August 30, 1935. The existing project provides for the improvement of Grays Reef Passage over a width of 3,000 feet and a depth of 25 feet through the east channel. The passage is through an unprotected waterway so there are no terminal facilities.

Project Map
Dredging Information

2022 PDF   
2022 Grays Reef PCS eHydro Website
2019 PDF  2019 DGN 
 2019 Grays Reef PCS - Sheet 1  2019 Grays Reef PCS - Sheet 1
 2019 Grays Reef PCS - Sheet 2  2019 Grays Reef PCS - Sheet 2