June 20, Suzanne Nash. June 4, Scenic driving. Michael Demetriou. May 12, Robert Hook. April 3, Deb Holberton. January 30, Trina Simpson. July 20, Casey Waun. Carla Paparelli. April 19, Dave Swanson. September 1, Matej Padela. July 31, Erica Ross. July 10, Karen Mae Wesolek.
August 25, Steven Kennedy. August 8, Show more reviews Showing results 1 - 30 of Add photos of this trail Photos help others preview the trail. Upload photos about this trail to inspire others. Share your route with others Help other users find their next route. Multi-use trail. Sinkholes, Shoepac Lake.
Nearest City or Town. The Sinkhole Area includes the Sinkholes Pathway as well as a portion of the High Country Pathway, three lakes and four rustic state forest campgrounds. In other words there are numerous opportunities in this recreational playground to hike, mountain bike, swim or cast a lure for northern pike and smallmouth bass. Collapse Back to top. A karst is a geologist's term for a limestone region where underground streams dissolved the rock into a series of large circular caves.
These caverns eventually collapse under the overwhelming load of sand, rock and clay left by the last glacier 10, year ago and the result is deep conical depressions throughout the forest called sinkholes. Sinkholes Pathway is a 2-mile loop around five sinkholes with a crossover spur that allows you to shorten the route to 0.
From Tomahawk Lake Campground, High Country Pathway heads north and within a mile reaches the trailhead of Sinkholes Pathway, turning the pathway into a round-trip outing of 4 miles.
In addition, numerous sinkhole lakes occur within Otsego and Montmorency Counties. The surrounding landscape typically supports mesic northern forest, boreal forest, limestone bedrock glade, and alvar in the uplands and groundwater-fed wetland systems such as northern fen, poor fen, intermittent wetland, and rich conifer swamp in the lowlands. Where deep outwash sands overlay sinkholes, drier upland types may occur including dry-mesic northern forest and dry northern forest. Some of the sinkholes in Montmorency, Otsego, and Presque Isle Counties are overlain by outwash sands and support vegetation characteristic of acid sands — no bedrock is exposed in these sinkholes.
Karst forms a dynamic, ever-changing landscape resulting from the dissolution of limestone, dolomite, or gypsum. The dissolution of the bedrock, often along faults or cracks in the bedrock, results in the creation of an underground drainage system rather than typical surface streams. As the dissolution of the underlying bedrock continues, it collapses in some locations and forms sinkholes, some of which seasonally or permanently flood to form lakes or ponds. Some underground streams of the karst regions reemerge as springs, sometimes off shore in Lake Michigan or Lake Huron.
Coarse woody debris loads from surrounding uplands provide important structural features within sinkholes. Recently formed sinkholes are often covered by fallen logs.
Although the vegetation is predominantly that of the surrounding forest, moister and cooler conditions may provide habitat for ferns, mosses, and lichens not typically found in the area of the sinkhole. Vertical limestone walls are often exposed along the margins of sinkholes and provide habitat for species characteristic of limestone cliffs. Where exposures of limestone are prevalent, sinkholes support a diversity of mosses, lichens, liverworts, and ferns.
Where sinkhole ponds or lakes develop, emergent marsh often rings the shore of the water. For information about plant species, visit the Michigan Flora website.
Indiscriminate use of sinkholes in Alpena County as dumps and landfills still occurs, which results in groundwater pollution and degrades and obscures these fascinating features. Ruberg and a team of researchers suspected then that others existed and had even investigated one 10 miles east of the nearshore system.
The sinkholes are the width of a football field or larger and range from roughly 60 feet deep closer to shore to feet deep among those located farther offshore, Ruberg said. There have been reports of as much in Lakes Erie and Michigan, Ruberg said. The shallow limestone sea bed that Michigan sits atop is porous and, over the years, lake water has dissolved ancient "carbonate critters" in the limestone to form cave structures and fissures in the bedrock, Ruberg said.
When the cave structures came too close to the lake bed, they opened into sinkholes. The remaining underground structures and porous limestone serve as a sort of pipeline through which groundwater is pushed from on land into the sinkhole. That flow can range from a slow, almost imperceptible seep to a regular stream or a reservoir that fills and then spills over into the sinkhole.
Over the years, as technology has developed, the crew has been able to use remotely operated vehicles to place sensors throughout the sinkholes to monitor the flow.
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