Sandstone Rapids Dam

Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University of Wisconsin - Green Bay

This is one of the very few outcrops of Cambrian sandstone in northeastern Wisconsin. The sandstone is beneath the south bank of the Peshtigo River below the dam and is only visible from the catwalk in front of the dam or from the opposite bank. However, there is no easy access to the opposite bank.

The River and Dam

Distant view of Sandstone Rapids Dam
Sandstone Rapids Dam
Sandstone Rapids Dam
North bank of the Peshtigo River, showing a thick moraine cut by the river.
View downstream. If you're lucky, you may see a bald eagle here.

The Outcrops

The outcrops can only be seen from the catwalk in front of the powerhouse.
Closer view of the outcrops
A small outcrop occurs along the concrete stairs.

Pleistocene Deposits

This small gully contains a lag deposit of large erratics that remained while finer material was washed away.
A nice intrusion breccia in the woods just off Highway W.

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Created 16 June 1999, Last Update 16 June 1999