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    • Have You Seen This Giant 90 Foot Deep Sinkhole In Alpena Michigan
    • Sinkhole - Michigan Natural Features Inventory
    • Sinkhole - Michigan Natural Features Inventory
    • USGS Topo Map Vector Data (Vector) 690 Alpena, Michigan 20200708 for 7. ...
    • Maps - Alpena Chamber of Commerce

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  3. www.visitalpena.com › adventures › sinkholesSinkholes - Visit Alpena

    While many sinkholes in the area are on private land there are some incredible locations that are open to the public. The Stevens Twin Sinks and Bruski Sink , Rockport State Park sinks, Sunken Lake , Mystery Valley, and Misery Bay sink are all easily accessed via woodland trails or a kayak ride out on the water.

  4. mnfi.anr.msu.edu › description › 10707Sinkhole - Michigan Natural Features Inventory

    • Graminoids
    • Forbs
    • Ferns
    • Shrubs
    • Trees
    big bluestem (Andropogon gerardii)
    blue-joint (Calamagrostis canadensis)
    sedges (Carex aurea, C. eburnea, C. flava, C. pensylvanica, C. viridula, and others)
    twig-rush (Cladium mariscoides)

    See full list on mnfi.anr.msu.edu

    wild sarsaparilla (Aralia nudicaulis)
    jack-in-the-pulpit (Arisaema triphyllum)
    wormwood (Artemisia campestris)
    harebell (Campanula rotundifolia)

    See full list on mnfi.anr.msu.edu

    lady fern (Athyrium filix-femina)
    rattlesnake fern (Botrypus virginianus)
    bulblet fern (Cystopteris bulbifera)
    oak fern (Gymnocarpium dryopteris)

    See full list on mnfi.anr.msu.edu

    bearberry (Arctostaphylos uva-ursi)
    sweetfern (Comptonia peregrina)
    bunchberry (Cornus canadensis)
    gray dogwood (Cornus foemina)

    See full list on mnfi.anr.msu.edu

    balsam fir (Abies balsamea)
    sugar maple (Acer saccharum)
    paper birch (Betula papyrifera)
    American beech (Fagus grandifolia)

    See full list on mnfi.anr.msu.edu

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  6. www.thealpenanews.com › news › local-newsAlpena-area sinkhole offers clues to planet’s early history

    Sep 13, 2021 · Off the shore of the mile-long, tree-clad island — which recently went on the market for $3.9 million — the sinkhole looms dark in a satellite image, a stark contrast to the light, Caribbean blue...

  7. www.visitalpena.com › places › sinkholes-at-rockportSinkholes at Rockport State Recreation Area - Visit Alpena

    Sinkholes at Rockport State Recreation Area. GPS: 45.202533, -83.384076, take US-23 North, turn right on Rockport Road, the park is at the end of Rockport Rd. Rockport is Michigan’s 100th State Park and is the first State Park where you are allowed to take a piece of it home with you.

  8. www.alltrails.com › trail › usRockport Quarry and Sinkhole Loop, Michigan - AllTrails

    Rockport Quarry and Sinkhole Loop. Easy • 4.1 (152) Rockport State Recreation Area. Photos (230) Directions. Print/PDF map. Share. More. Length 6.0 miElevation gain 203 ftRoute type Loop. Experience this 6.0-mile loop trail near Alpena, Michigan. Generally considered an easy route, it takes an average of 1 h 55 min to complete.

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