Grassy Cove is walled in by Brady Mountain to the west, Bear Den Mountain on the east, and Black Mountain to the north. Brady and Bear Den both converge in a V-shaped formation to enclose the cove to the south. Just beyond this convergence,
Hinch Mountain— the highest point in Cumberland County— rises to . The southern slopes of Hinch descend drastically to the Sequatchie Valley. The elevation of Grassy Cove is just over , whereas the elevation of the Sequatchie Valley is roughly . Both the Sequatchie Valley and Grassy Cove were part of an
anticline that formed as rock strata were bent upward by thrust faulting to form a large ridge during the
Paleozoic era (appx. 250 million years ago). During the
Mesozoic era, continued erosion along this ridge exposed its younger, more soluble Mississippian aged
limestone layers. Over subsequent millennia, the limestone dissolved, forming a series of
sinkholes that eventually coalesced to create the Sequatchie Valley. Grassy Cove is one such sinkhole that has yet to coalesce with the rest of the Sequatchie Valley. Grassy Cove is drained entirely by underground streams. The valley's main stream, Grassy Cove Creek, flows northward across the cove before dropping into Mill Cave on the slopes of Brady Mountain. Dye traces indicate that it flows south through a series of caves before reemerging at the head of the Sequatchie Valley at
Devilstep Hollow Cave, where it forms the headwaters of the
Sequatchie River. Grassy Cove Saltpeter Cave, located on the eastern slope of Brady Mountain, is the sixteenth longest cave in Tennessee and one of the 100 longest caves in the United States. Other caves in the cove include Windlass Cave, Bristow Cave, Mill Cave, Run to the Mill Cave, and Milksick Cave. Sinkhole dimensions: • Watershed Area: • Watershed Perimeter: • Sinkhole Area: • Sinkhole Perimeter: • Sinkhole Depth: • Sinkhole Volume: • Sinkhole Minimum Elevation: at 35.856046, -84.927142 • Sinkhole Maximum Elevation: • Sinkhole Major Axis: • Sinkhole Minor Axis: • Sinkhole Declination: 30.8 degrees • Pour Point: 35.826952, -84.90215 ==History==