Ice Coverage
02/28
Coast Guard icebreakers are encountering more ice this winter than they've seen in the past several years, the Detroit Free Press reported.
Much of Lake Huron, Lake Erie, the Detroit River, Lake St. Clair and the St. Clair River have more ice cover this year than in the past few years. One Coast Guard crew recently encountered ice more than 2 feet thick off Lake Erie's Point Pelee. They also ran into 20-foot-high windrows.
"There's certainly more ice cover than we've seen the last five or six years," said Ray Assel, physical scientist with the National Oceanic and Atmospheric Administration.
Ferry service to Harsens Island was interrupted for a couple of days earlier this week by ice. Early Sunday, a wall of ice from Lake Huron blocked access to the island, said Nancy Bryson, office manager of Champion's Auto Ferry, which offers ferry service between Harsens Island and Algonac.
Lake Huron is packed, she said.
"I heard the ice is wall-to-wall, no gaps, up past Lexington," Bryson said. "There's a lot of ice out there, monstrous ice. It's not sheet ice, as we call it. This is chunks 5-feet thick."
During an average Michigan winter, about 70 percent of Lake Superior would be covered by ice, Assel said. But because of the lake's 483-foot depth, it doesn't completely ice over.
Likewise, about 70 percent of Lake Huron will typically be covered by ice during winter. Its depth, like Lakes Superior and Michigan, usually prevents it from completely icing over.
Besides its depth, Lake Michigan's large surface area limits ice cover to the northern end and around the shoreline areas farther south. Lake Ontario's depth also keeps ice from completely covering it.
Ice almost always forms on Lake Erie, because it is the shallowest of the lakes.
"In fact, it's big news when it doesn't form an ice cover," Assel said.
Ferries to and from Mackinac Island were able to run all winter long in 2002. This winter the ferries stopped running Jan. 21, which is about the normal date for the ice bridge to form between the island and St. Ignace.
"Usually, we start running again toward the end of March or early April," said Bob Brown, general manager of Arnold Lines. "This year it could be a little later."
Click here to view recent ice thickness on the Great Lakes
Reported by: Robin Simmons