• Autumn colors along Chapel Beach on a sunny fall day.

    Pictured Rocks

    National Lakeshore Michigan

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  • 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 »

Air Quality

This aerial view of Spray Falls and the Pictured Rocks cliffs was taken from a small airplane. 

Spray Falls

NPS photo / Karen Gustin

Pictured Rocks National Lakeshore is designated a Class II area under the Clean Air Act. An assessment based on lichen flora and elemental analysis suggested that air quality in the vicinity is quite good.

Although large-scale heavy industry is quite distant from the national lakeshore, some long range/global atmospheric transport of pollutants to this area has been documented. Acid deposition in the central Upper Peninsula is a well-established phenomenon. Long-range transport of toxics/pollutants has apparently influenced other remote park units in the region more than Pictured Rocks National Lakeshore.

No baseline information exists on any ambient air quality parameter within the park boundary. There is an ozone monitoring station at Marquette, Michigan, 75 km (45 miles) to the west.

Did You Know?

The Grand Sable Dunes are located just west of Grand Marais, Michigan, in Pictured Rocks National Lakeshore.

The Grand Sable Dunes are a federally designated Research Natural Area. The five square miles of dunes are an unusual glacial kame terrace with overlying dunes caused by fluctuating lake levels over the centuries. The dunes are located in Pictured Rocks National Lakeshore, near Grand Marais, Mich. More...