Invasive species threatening historic Michigan shipwrecks


By Jon Gaskell

Capital News Service

LANSING — Thousands of shipwrecks lie at the bottom of Michigan waters. These cultural treasures attract thousands of visitors to the state, but changing conditions in the Great Lakes threaten their preservation.

According to Tom Graf, a water resource specialist with the Department of Environmental Quality (DEQ), the Great Lakes are home to an estimated 6,000 shipwrecks with about 2,000 of them in Michigan.

Built in 1890 and sunk in a collision just five years later, this 300 ft freighter, Norman, is located at the bottom of Lake Huron. Photo courtesy of

But the Great Lakes hold more than just ships. Piers, wharves and an estimated 200 military aircraft lost during training exercises in World War II litter the lake’s floor.

Terry Begnoche, site manager of the Great Lakes Shipwreck Museum in Paradise, said the cold freshwater keeps these underwater cultural treasures preserved.

“Every site is a time capsule of sorts,” Begnoche said. “They give us a lot of clues about the history of the state. Even wooden ships are well-preserved in these waters. Unlike the ocean, we don’t have small organisms that eat away at the wood.”

Begnoche said “We have people come from around the world to dive the Michigan sites every year. Here at Whitefish Point, we’ve seen European tourists and folks from across the country, looking to see the ships.”

Valerie Van Heest, director of Michigan Shipwreck Research Associates in Holland, said those conditions make Michigan one of the best states for underwater exploration.

“A new shipwreck discovery that is shared with the public can generate an immediate tourist draw to the region,” Van Heest said. “These tourists infuse dollars in food, gas, lodging and land-based attractions.

“Consider the 1996 discovery of the wreck of the Three Brothers at South Manitou Island. That discovery brought reportedly over 1,200 people to the island that summer alone, specifically to dive or snorkel the shallow wreck,” Van Heest said.

Last year, Michigan Shipwreck Associates discovered its oldest wreck, a 180-year-old sailing ship at the bottom of Lake Michigan between Saugatuck and South Haven.

The group is currently searching Lake Michigan for the remains of Northwest Orient Airlines Flight 2501, a DC-4 airliner that crashed in 1950, killing all 58 on board.

The cold, fresh water of Lake Huron helps to preserve shipwrecks that lie deep at the bottom. Photo courtesy of

“That crash was the deadliest airline crash of that time,” Van Heest said. “Finding it would be an incredible discovery.”

But cultural and economic resources like these wrecks are deteriorating, according to the DEQ. The department blames human intervention and invasive species like quagga and zebra mussels.

While the DEQ is charged with punishing divers who remove, alter or destroy artifacts from underwater preserves, Graff said the illegal practice is nearly impossible to stop.

“It’s extremely hard to police these sites,” Graff said. “They are so remote and widespread that we aren’t able to effectively stop divers from harming wrecks.”

But the biggest threat for the long-term survival of the wrecks comes from invasive species.

According to Begnoche, zebra and quagga mussels are both a blessing and a curse for Michigan diving.

“At first it was nice because those mussels are filter-feeders and cleaned up the water. That improved visibility and made conditions even better for divers,” Begnoche said. “But now it has gotten out of hand.

“It used to be you could see all of the details like the name of the ship or even paint that had been there for decades,” Bergnoche said. “Now you can’t see that level of detail, and shipwrecks here look a great deal more like what you would find in the oceans.”

2 thoughts on “Invasive species threatening historic Michigan shipwrecks

  1. That’s the problem when you introduce something into an environment that’s not it’s natural habitat….no natural predators. Then when you introduce the natural predator to the environment it’s the same cycle – they will then get out of hand and it’s a neverending cycle….

  2. we have native predators for the zebra/quagga mussels, the GLMRIS release I got yesterday, says mussel eating predators are now part of the plan. I see no reason why we have to wait until the end of 2013 (speeded up plan)to implement this invasive species control, or wait to use predators for the other invasives including asian carp. Since the plan seems to be to fill lake Michigan back up with alewives, the mussels will continue to spread and increase.

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