Straits of Mackinac

Located between Michigan's Upper and Lower Peninsulas

The Straits of Mackinac, spanned by the Mackinac Bridge, seen from the southern shore

The Straits of Mackinac is the strip of water that connects two of the Great Lakes, Lake Michigan and Lake Huron, and separates the Lower Peninsula of Michigan from the Upper Peninsula of Michigan. It is a shipping lane providing passage for raw materials and finished goods, connecting, for instance, the iron mines of Minnesota to the steel mills of Gary, Indiana. Before the railroads reached Chicago from the east, most immigrants arrived in the Midwest and Great Plains by ships on the Great Lakes. The straits is five miles (8 km) wide at its narrowest point, where it is spanned by the Mackinac Bridge. Before the bridge was built, car ferries transported vehicles across the straits. Today passenger-only ferries carry people to Mackinac Island, which does not permit cars. Visitors can take their vehicles on a car ferry to Bois Blanc Island.

Islands in the Straits of Mackinac include the two populated islands, Bois Blanc and Mackinac, and two that are uninhabited: Round and St. Helena islands. At 11 miles (18 kilometers) in length, Bois Blanc is the largest island in the Straits.

The straits are shallow and narrow enough to freeze over in the winter. Navigation is ensured for year-round shipping to the Lower Great Lakes by the use of icebreakers.

Geology and history[link]

Satellite photograph of icebreaker paths through the ice in the Straits. The Mackinac Bridge is the vertical line in the center, connecting the landmass of the Upper Peninsula above to lower Michigan below. The icebreaker paths run right-to-left, connecting the open water of Lake Michigan with the open water of Lake Huron between Mackinac Island and Round Island.

The Straits are 5 miles (8.0 km) wide and 20 fathoms (120 ft; 37 m) deep.^[1] Hydrologically, they do not connect two separate lakes, but rather are a narrow point defining two lobes of a single Lake Michigan-Huron.

The Straits were an important Native American and fur trade route. Located on the southern side of the Straits is the town of Mackinaw City, Michigan, the site of Fort Michilimackinac, a reconstructed French fort founded in 1715, and on the northern side is St. Ignace, Michigan, site of a French Catholic mission to the Indians, founded in 1671. The eastern end of the Straits was controlled by Fort Mackinac on Mackinac Island, a British colonial and early American military base and fur trade center, founded in 1781.

Straits of Mackinac today[link]

The Straits are patrolled by a detachment of the United States Coast Guard based at Graham Point, St. Ignace. A shipping channel through the winter ice is maintained by the Coast Guard's Great Lakes icebreaker, USCGC Mackinaw, based in Cheboygan, Michigan near the eastern edge of the Straits. This new vessel went into service during the 2005-06 ice season.

Most of the Straits have been set aside by the U.S. state of Michigan as the Straits of Mackinac Shipwreck Preserve, a riparian public space dedicated to those personnel who were lost aboard the boats and ships that sank in these dangerous shipping lanes.

Lighthouses in the Straits of Mackinac include:

• The McGulpin Point Light, on McGulpin Point, 3 miles (4.8 km) west of Fort Michilimackinac.
• The Old Mackinac Point Light, in Mackinaw City, Michigan, which is open to the public.
• The Round Island Light on Round Island, which is not open to the public but which can be viewed from the Mackinac Island ferry channel.
• The St. Helena Island Lighthouse, which is not open to the public but is visible from a rest area on U.S. Highway 2 at Gros Cap, Michigan west of St. Ignace, Michigan.
• The Bois Blanc Light, which is not open to the public, on the northern shore of Bois Blanc.

2008 panorama of the Straits from Mackinac Island

See also[link]

• Huron Lightship
• Straits of Mackinac Shipwreck Preserve

References[link]

External links[link]

• Straits of Mackinac Shipwreck
• Lighthouses in the Mackinac Strait
• Lighthouses of the Straits of Mackinac

Coordinates: 45°48′50″N 84°45′00″W / 45.81389°N 84.75°W / 45.81389; -84.75

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