This is a wash typical of Southern Utah. WARNING: DO NOT ATTEMPT THIS IF THERE IS ANY SIGN OF RAIN ANYWHERE IN THE AREA, AS THE WASH IS PRONE TO FLASH FLOODING. When it is not raining, the stream bed is normally dry most of the year.
Walk through the tunnel. It was bored to allow water to flow under the new alignment of the highway up on the dugway. Note how far down the water has eroded in just the last half century. After you get out of the tunnel, note the several different rock strata and how some form cliffs while others form slopes. You'll see lots of cool deposition and erosion in the stream bed as well.
To get to the cache, follow the stream bed generally. The ability to hike in the bed depends on the time of year, so you may find it necessary to leave the bed if the willows are thick. Look for deer trails to follow. Halfway up or so, you'll come to a cool obstacle. It can be scaled (coming down is easier), but we backtracked a little and found a better way up and around it.