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Go See It

Arch Rock: Go See It

A natural limestone arch on the east side of Mackinac Island that one early account put at 80 feet in 1812 and another at 140 feet in 1817.

Looking through Arch Rock, a natural limestone arch on Mackinac Island, at Lake Huron and a shoreline road below. Photo by Michael Barera, CC BY-SA 4.0, via Wikimedia Commons, resized.
Looking through Arch Rock at Lake Huron and the shoreline road below. Photo: Michael Barera, CC BY-SA 4.0, via Wikimedia Commons, resized.

The facts

Drive
2 hr 34 min from Marquette
Cost
Free
Season
Ferries: both list April 21 through October 31, 2026
Hours
Mackinac Island State Park is open 24 hours a day…

Address

Arch Rock, east side of Mackinac Island, Mackinac County

Directions

More detail

From Marquette
, 159 miles, to St. Ignace, where the Bridge lands in the U.P., by M-28 E and US-2 E. Mackinaw City is across the Bridge from there. Google Maps, usual traffic, read Sept. 26, 2026
Cost
The Mackinac Island Tourism Bureau lists getting up close to Arch Rock as free, in a July 2023 post
Season
Arnold has its own schedule for Oct. 26 to 31
Hours
Mackinac Island State Park is open 24 hours a day, 365 days a year. The Milliken Nature Center on Arch Rock Plaza is open 9 a.m. to 6 p.m. through October 25, 2026
From the Bridge
About 9 minutes and 5 miles to the Arnold Transit St. Ignace main dock (Google Maps route, usual traffic, read Sept. 27, 2026). Cars are not allowed on the island, so the rest is the ferry

The height nobody agrees on

Arch Rock’s height depends on who you ask and when. A geography book published in 1812 put it 80 feet above the lake. A letter written in 1817 said 140 feet from the water. Mackinac State Historic Parks now says more than 140 feet, and the Tourism Bureau says some 145.

The early accounts also say people walked over the top of it. Captain David Bates Douglass wrote that several officers had, at what he gave as 147 feet, and added that he should think it a rash enterprise. Do not repeat it.

The Tourism Bureau says the evidence puts the arch at about 4,000 years old, hollowed out by waves when lake levels were much higher, with the limestone breccia left standing. It says Mackinac National Park was created in 1875 in part to protect Arch Rock. Mackinac State Historic Parks calls that park the United States’ second national park, before it became Michigan’s first state park in 1895.

People have predicted since the 1800s that the arch would fall. The Tourism Bureau calls it a stable formation that should last for the foreseeable future, and also says it will probably come down someday, which is its argument for going now.

Before you go

Sources

Verified September 26, 2026

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