"Against all reason, I knew now what horror I had unwittingly loosed upon the countryside—I and the blind forces of nature—the horror from the middle span."
August Derleth and H. P. Lovecraft, "The Horror From the Middle Span," 1971
You're looking for a micro container. I had originally placed it atop the big pipe, right at the middle span, but this posed safety and permissions issues, so I've modified it to be a bit easier, to reward you for your hike (you do not have to go out on the pipe). There are supernatural influences here, for sure, for during my maintenance visit, my GPS proved utterly useless—a first, in my experience. Thus the explicit hint below.
The intertwining trails here are very scenic and offer plenty of views of the river, flora, and wildlife. The area north of the mushroom trail is mostly private property, so please don't wander beyond the northernmost leg of the trail. Note: Unless you're keen on wading the Smith River (not advisable), this area is not accessible from U.S. 220 or other points south and west of the river itself; you'll need to follow the residential roads (via Mulberry Rd.) to the specified parking coordinates. Since parking on the dead-end street at night may draw undesired attention from nearby neighbors, I strongly recommend hunting this and the other caches in this area only during daylight hours.
Congrats to Spring 1, FTF.