The Upper Youghiogheny River is the ultimate whitewater run for expert paddlers in Maryland. It's one of the premier streams in the entire eastern United States, and is attempted only by expert boaters accompanied by someone who knows the river.
The rapids on the Upper Yough are steep, technical, and above all, continuous. In fact, for no fewer than 7 miles, the river is virtually one single rapid! The river drops almost 1,000 feet from the put-in at Sang Run to the take-out at Friendsville.
Fortunately for geocachers, in 1976 a 21 mile long segment of the Youghiogheny River was designated as Maryland's first Scenic and Wild River. The public now has access to a state protected corridor managed by the Forest and Park Service that runs along the river from Miller's Run just north of Oakland to the town of Friendsville.
During the late 1800's Garrett County prospered and grew, and one of the primary resources its economy was based on was timber. Because of the multitude of falls and rapids on this section of the Yough, the harvested timber in this valley couldn't be floated downstream. The arrival of the B&O railroad from the east after the Civil War solved the problem of transporting this lumber to market. In 1889, a branch line,the Confluence and Oakland Railroad, was built that followed the path of the river south from Confluence, Pennsylvania, and extended up the Youghiogheny River two miles beyond Friendsville to the line's remote terminus of the town of Kendall. (A complete connection was never made to Oakland because of the steepness of the canyons.) Today, little remains of the town of Kendall but a few old stone foundations and a pile of oxidized coal. Although the well graded old railbed ends at a gulley with a stream flowing through it at Kendall, an old logging road continues beyond that and eventually becomes just a path along the river bank, until even that peters out.
To get to the cache you have three choices: 1) you can try to run the river from the public access point at Sang Run (N39º 33.933', W079º 25.599') in a kayak, 2) if you don't mind portaging a few rough spots you could mountain bike most of the way, or 3) you can hike.
If you're a landlubber, start at the gated public access point for the Youghiogheny River Corridor at Friendsville (N39º 39.717', W079º 24.453'). Follow the old 
railbed/logging road/path as far as it will take you, and then either rock hop along the river or bushwack through the thicket the rest of the way.
If you intend to run the river, you'd better know what you're doing. 
There have been many broken oars, boats, and bones along this river, and because of the remoteness of this area, rescue is very difficult. If you intend to take the land route, don't stray from the corridor. Because of the politics involved with the Scenic and Wild River Act, and the pattern of private land ownership along the river, you may get a butt full of buckshot and very little sympathy.
Now, disclaimer aside, imagine a true wilderness experience along a wild and scenic river that has large boulders, plenty of white water as well as calm green pools, cascading through a lush forest teeming with wildflowers and wildlife. It's not an easy trek 
, but it's quite an adventure!