There is a beach hazard statement from the National Weather Service from Tuesday morning, September 21 through Thursday evening, September 23, 2021. Expect high waves and dangerous currents at Lake Michigan beaches. Remain out of the water to avoid dangerous swimming conditions and do not venture out onto piers, jetties, breakwalls or other shoreline structures.

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Pinhook Bog in Fall - Indiana Dunes National Park
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Pinhook Bog

The Indiana Dunes National Park's amazing Pinhook Bog has been designated a National Natural Landmark. Pinhook Bog is about 580 acres; a quarter of that is made up of a floating three-to six-foot-thick layer of sphagnum moss. This delicately stringy, highly absorbent light-green moss is very acidic and was used in olden days as an antiseptic for wound care.

The thick layer of sphagnum moss is like a raft floating on top of an ancient, now-hidden lake. It keeps everything from tamarack trees to blueberry shrubs and insect-eating pitcher plants alive.

The rare and fragile ecosystem that makes up the bog is only accessible during ranger-led tours. Check our Indiana Dunes events page or contact the Indiana Dunes National Park Visitor Center at 219-395-1882 for information on upcoming tours.

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Would you like more information about the South Shore and the Indiana Dunes? Use the links below to request a visitor's guide be mailed to you, download our Indiana Dunes brochure, join our e-newsletter list or sign up for text alerts.

• Mail me a Visitor's Guide

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