Grand Sable Dunes temporary closure to all public entry for visitor safety
Grand Sable Dunes are rapidly eroding into Sable Creek and Lake Superior. The area from the Ghost Forest Trail north to Lake Superior then along the shoreline to the west side of Sable Creek is temporarily closed. Follow closure signs for your safety. More »
Pictured Rocks National Lakeshore is home to more than 230 species of lichens, including some rare for the Great Lakes region. Visitors can find lichens in almost every lakeshore habitat, from bare ground to open sand plains, on rocky outcrops along waterfalls, in white cedar wetlands, and attached to the bark of many mature trees.
Air Quality Sentinels
Some lichens make excellent air quality bio-indicators as they are particularly sensitive to airborne contaminants. Lichens are so sensitive to sulfur dioxide that it is possible for scientists to calculate the amount of this pollutant in the atmosphere by mapping the occurrence or disappearance of certain lichens in a given area. Researchers have found these particular species here at Pictured Rocks with no signs of damage due to pollution, indicating that air quality in this region is quite good.
Did You Know?
Chapel Lake is one of several plunge pool lakes created by post glacial rivers after the Marquette advance of the most recent ice age. Its greatest depth is 140 feet. Other plunge pool lakes include Deer Lake and Ginpole Lake in Alger County, home of Pictured Rocks National Lakeshore. More...