Location: Our old house in Tennessee.
Trail: 1/8 mile with 170' elevation loss to the river
Dogs: Always allowed

I'll say right off that this isn't a public trail. It's a trail that runs through a piece of property we owned for a bit.

Andra and I built this trail, with some help from my friend Mike Mendez, in the ~7 acres of woods behind our house as a means to easily access the Collins River, which is about 500 ft west of, and 150' below, the house. When we moved in there was no simple access, but over the course of 4 months in 2010, we hacked a passable route through the woods, involving some switchbacks, rock steps and a wooden bridge over the gulley. I walk it twice virtually every day with dogs, before and after work, and when the weather is fair, Andra and Ada come along. The topography of our place is actually fairly lucky, in that we have on our place one of the infrequent gulleys that forms a valley all the way to the river, cutting through the steep limestone cliff bands that typically line this side of the river. I suspect it would be nearly impossible for any of our neighbors to get down to the river from their house without climbing gear, so we are fortunate to have a natural passage to the water that needed only minor excavation to make the walk a leisurely stroll.

The Collins River starts high up on the Cumberland Plateau in Grundy County, the county just south of Warren County where we live, and is a large tributary of the Caney Fork River, which it meets at Rock Island Reservoir, which in turn flows into the Cumberland River that runs through Nashville on its way to the Tennessee River. The trail runs down to a section of the Collins River that is about 60 feet wide, and runs around 250 cfs in the summer, 500 cfs in the winter. A big storm just last month pushed the flow to over 12,000 cfs, and the big Nashville flood of May 2010 was preceded by a flow of over 20,000 cfs at the guaging station about 5 miles upriver. We see giant logs high up on the banks that were deposited by that flood, though we were not living here at the time. In the summer, the river is shallow enough to wade without getting my naval wet, and warm enough to do it without waders. The bottom of the river is rocky and rough, and can be tricky to negotiate when the water is too murky to see the bottom, so it's lucky that usually the water is crystal-clear. Red eye bass and crappie inhabit the waters, and on many occasions, we've caught lots of fish. I've never seen any, but champion-size muskie also prowl these waters. One guy caught a 42-inch muskie just a few miles upriver this summer. 

Halfway to the river, a spring flows out from the limesone cliff and drops water in a thin veil over a carpet of moss and ferns about 10 feet down to a jumble of rocks below, where it sinks back into the ground among ferns and moss, and is gone. In the driest depths of summer, the water slowed to a trickle, but never stopped. As winter has come on, the falls has expanded to a width of about 20 feet, with an 8-foot gap in the middle. This effusion of cold groundwater acts like an air conditioner for the little gulley all summer, and the cold air coming out of the depths is always refreshing. There's a hole in the cliff near the bottom that must lead to some network of underground caves, as there's always a cold wind blowing out of it, enough to cause the dangling fern fronds to dance back and forth even when the air outside is dead-calm. In cold weather, the constant temperature is warmer than the surrounding air, and thus steams as it issues forth from the rock, even as the water below stretches out into white icicles. 

The forest that our trail threads a path through is native eastern hardwood type, with spectacular diversity. I've catalogued 43 native tree species and, with Andra's help, located and mapped what I believe are the largest diameter specimens of each species (I've not measured heights of the trees, yet, but that project is in the works: Mike Weigand and I measured a northern red oak at 103' tall). The largest tree we have is a tuliptree with a diameter of 34.7 inches, followed by a 28-inch northern red oak, a 26-inch scarlet oak, a 25-inch white oak, a 24-inch southern red oak and a 24-inch post oak. There are lots of other big trees, but no species other than these has any specimen exceeding 2 feet in diameter. My survey of the woods in the fall yielded a density of 506 trees >3" circumference (breast height)/acre, with an average tree diameter at breast height of 16" (again, discounting saplings <3" in diameter).

There are hundreds of brown and orange toads, leopard frogs and salamanders that stalk the undergrowth. White tail deer pass through, but rarely, and run like hell when they sense I'm around, crashing and snorting through the woods. Possums lurk about, usually at night, and probably racooons, though I've never seen the latter. Gray squirrels fling themselves from branch to branch high in the canopy, but I'm surprised there are so few of them, given the billions of acorns, hickory nuts, pine nuts and beech nuts lying around. I personally know guys who squirrel hunt, so that may explain why numbers are lower around here than other urban places I've lived. Coyotes surely charge through the woods, though I've only seen them on the neighbor's place, or heard them in pastures down the road at night as they yip and chatter under a full moon. Stray cats and dogs slink through frequently, to the everlasting annoyance of Henry and Makenzie, who froth and boil when they see such interlopers out the front window. River otters ply the water, and I've been lucky enough to see one within 10 ft, in addition to seeing their little heads part the water in a V from afar. I've seen teeth marks on the bark of downed trees in the river, which seems to indicate beaver, though I've seen no evidence they are felling trees or building dams anywhere around. Bats flitter about the woods on summer evenings, and insects of all sorts thump into the back of the house when it is lit up. Hundreds of small ringneck snakes slither around, seemingly fashioning a home under every rock and log in the forest, and though I know there must be legions of other snakes around, I've only seen a black racer and a beautiful adult copperhead, the latter much closer than I would have preferred. 

The trail to the river is complete, mostly, though there are some rocks yet to be pushed into place to keep erosion to a minimum. Though it's only 1/4 mile roundtrip, the 3-4 miles that accumulates each week on the thing adds up to make it the highest source of hiking mileage I get these days. I'm eager to expand, though. The next trail is likely to be a spur trail that will head up to the high point of the land and over to a rock outcropping that overlooks the river far below, a loop that should easily double the current length. There's never any excuse to be bored here.