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a Wisconsin state park, forest, recreation area or trail.
Camping opportunities
in state parks and forests.
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a vehicle admission sticker or state trail pass.
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to attend a nature program or event with family and friends.

Straight Lake State Park Geology

About 1.1 billion years ago, the area that is now Straight Lake State Park was part of a mid-continental rift. Magma oozed out of the rift forming basalt, which can still be seen in several areas of the park. Many years later, during the last Ice Age, many of the park's features, as seen today, were formed. The most distinctive glacial feature in the park is the tunnel channel - formed when pressured water flowed under the glacier to cut the channel. This channel can be seen on the Ice Age Trail to the east of Rainbow Lake. Other glacial features in the park include a boulder valley, glacial erratics, eskers, kettles and hummocks.

Last revised: Wednesday December 13 2017