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Triangle Lake Bog State Nature Preserve


Triangle Lake Bog exhibits all of the attributes of a classic “kettle hole” bog.  At its center is a cold deepwater lake over 35 feet in depth.  Surrounding the lake are concentric communities of similar vegetation from the water’s edge to the higher surrounding landscape beyond the bog basin.  At the waters edge is a floating mat of vegetation seemingly reaching across the face of the water.  Leatherleaf and swamp loosestrife provide a springboard for other plants growing at the waters edge.  Virginia chain fern, tawny cotton-grass, marsh fern, and several species of sedge, along with the omnipresent sphagnum mosses, are found on the raft of floating vegetation.  Beyond these small plants in the meadow is a narrow ring of tamarack trees.  These stately conifers are among the most unique plants in the preserve.  While bearing needles and cones, they are deciduous, dropping all of their needles early each November after turning a spectacular yellow for a few days. 

There are several insectivorous species found in the bog.  Along the boardwalk one can see the spectacular pitcher-plants growing in rosettes with large leathery pitcher-like leaves.  The water trapping leaves also serve as prisons for insects that are attracted to the plant.  These, in turn, become nutrition for the plant and insure its survival in the harsh environs of the bog.  Also, the tiny leaves of the round leaved sundew are found here in the meadow, luring small insects to what appears to be a meal of nectar, but which becomes a sticky trap that ensnares the hapless diners.

Fruits are important sources of food for the birds and other animals living in the bog.  Fruiting shrubs include highbush blueberry, poison sumac, black huckleberry, large and small cranberry, winterberry, and catberry.

  • Open 1/2 hour before sunrise to 1/2 hour after sunset
  • Stay on designated trails
  • Pets are not permitted
  • No restrooms
  • *Caution* poison sumac is frequent just off the boardwalk


0.3 miles of hiking trails


Call: 911



Natural Features

    Available Trails