Isle Royale National Park Locator Map

Fast Facts

Total Area
571,790 acres
Annual Visitation
16,663 in 2012 (view all years)
Creation Date
March 3, 1931
Entrance Fee
$4 per person per day
Time Zone
Lowest Elevation
601 feet at Lake Superior
Highest Elevation
1,394 feet on Mount Desor
Lowest Average Temp
-3F in January
Record Low Temp
-43F in 1996
Highest Average Temp
75F in July
Record High Temp
95F in 1995
Our Last Visit

Park Contact Information

Isle Royale National Park
800 E Lakeshore Drive, Houghton, MI 49931
Info at (906) 482-0984
Fax to (906) 482-8753

Park Creation Timeline

On March 3, 1931, President Herbert Hoover signs the legislation authorizing the creation of the park.
On April 3, 1940, President Franklin D. Roosevelt signs the legislation that formally establishes the park.
International Biosphere Reserve status is given to the park by UNESCO (United Nations Educational, Scientific and Cultural Organization).

Animals and Plants

The most common large mammals are moose and gray wolves. The interaction of these two species in the park has been extensivley studied. Other smaller mammals include Isle Royale red squirrels, red foxes, river otters, mink, snowshoe hares, muskrats, beavers, and several species of bat.
Reptiles include several types of snakes, such as common garter, black rat, and northern redbelly. Painted turtles are also present. Amphibians are more common, with several types of salamanders, toads, and frogs.

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