Grand Traverse Harbor dredging set to resume this week in Houghton County

Dredging crews will return to the Grand Traverse Harbor in Houghton County this week to help keep the Grand Traverse Harbor open and operating.

Over the past roughly 100 years, historic copper mine tailings from the Wolverine and Mohawk mines – called stamp sands – were deposited at a milling site along Lake Superior, located in the community of Gay in Keweenaw County.

Since that time, the stamp sands have been moved by winds and waves south down the shoreline roughly five miles, inundating natural sand beach areas and threatening to cover spawning habitat and recruitment areas important to Lake Superior whitefish and lake trout associated with Buffalo Reef.

The natural reef is located beneath the waters of Grand Traverse Bay.

“This current dredging project is being done to combat clean sand that has naturally accumulated in the harbor,” said Jay Parent, district supervisor of the Michigan Department of Environment, Great Lakes, and Energy’s Water Resources Division in Marquette. “While this will benefit both recreational and commercial use of the harbor, the primary purpose is to keep the harbor operational as the Buffalo Reef Task Force continues to mitigate damage to Buffalo Reef and develop a long-term solution to the stamp sand issue.”

To help combat the threat posed to the reef and the harbor by the migrating stamp sands, various dredging efforts have taken place over the past few years, including removal of a 25-foot-high bank from the Lake Superior shoreline in 2019.

“Past harbor dredges have been undertaken to remove stamp sand that had entered and blocked the harbor,” Parent said. “Since then, dredging efforts by EGLE and Keweenaw Bay Indian Community have successfully intercepted the material from the stamp sand beach adjacent and north of the harbor before it overtops the harbor wall.”

Meanwhile, the multi-agency Buffalo Reef Task Force continues to move forward with a long-term strategy to combat the stamp sands problem at the Grand Traverse Bay Harbor and Buffalo Reef.

Over the past several years, the task force evaluated the feasibility and cost estimates of more than a dozen potential ideas for disposal of dredged stamp sands removed from threatening the natural 2,200-acre reef.

The task force decided ultimately to construct an upland facility for disposal of stamp sand removed from the Lake Superior shoreline. In addition, a 2,000-foot-long jetty would be constructed to intercept the stamp sand as it migrates south.

Dredging the harbor at the mouth of the Traverse River is needed to continue the broader efforts to save and restore Buffalo Reef, but it will have other immediate impacts as well.

The U.S. Army Corps of Engineers said beyond loss of fish habitat, the consequences of not maintaining the dredging project include damage to property and potential loss of privately owned docks and a public boating access site located along the riverfront, loss of local jobs, recreational and charter fishing in the area, erosion and pollution of natural shoreline leading to habitat reduction for benthic, marine and terrestrial organisms and impacted wetlands.

The Buffalo Reef project, funded in part through the Great Lakes Restoration Initiative and an appropriation from the State of Michigan, is being executed in cooperation with the U.S. Army Corps of Engineers, U.S. Environmental Protection Agency, Keweenaw Bay Indian Community, the Great Lakes Indian Fish and Wildlife Commission, the Michigan Department of Natural Resources and the Michigan Department of Environment, Great Lakes and Energy.

For more information on the ongoing effort to save Buffalo Reef, or to sign-up for the latest email updates, visit Michigan.gov/BuffaloReef.