• Indianhead Point stands tall along the Pictured Rocks. Photo copyright Craig Blacklock

    Pictured Rocks

    National Lakeshore Michigan

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    Grand Sable Dunes are rapidly eroding into Sable Creek and Lake Superior. The area from the trail to the Grand Sable Dunes north to the beach along Lake Superior 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 by 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 flowers of submerged buttercups rise above the surface of the water and can be quite showy, even when small.

Several species of plants in the Buttercup Family are aquatic, growing underwater in lakes and ponds. A few are even amphibious, meaning that a single plant lives partly on sand along a shoreline and partly submerged. Such plants have runners, like a strawberry plant, and grow roots along the runners. The submerged leaves appear quite different from the ones growing in air.