My wife and I walked two thirds of the trail. Finding the trail was a little tricky. When we got to the trailhead there was no real sign identifying it, but it was obvious it was an abandoned rail road spur.
The trail bed is unimproved, but clear of weeds. It is a gradual slope following the Palouse River. We spotted what looked like a great swimming hole and commented about how nice it would have been to take a skinny dip there.
About halfway down the trail you come across another gate which did have a trail maker on it! A short distance down the trail from that gate, though, there is the remnants of an old bridge across a small gully. There is a sign there indicating the bridge is unsafe to cross, but there is a bypass path around that bridge.
The trail enters into a small canyon which is very scenic. There appears to be a road above the canyon, but we did not notice any traffic. Due to the time, though, we had to turn back.
As we reached the trailhead we met some high school boys who said they were going up to the swimming hole to take a dip. They did not appear to have swimming trunks. Later, we had to laugh about what it would have been like if they came across two people old enough to be their grandparents skinny dipping in that hole, or if we had gone just a little further and then came across them as they were skinny dipping.
I believe this old spur would have eventually lead to a covered bridge, but it is apparently on private property and cannot be accessed. I would hope that the conservatory would work with the county to arrange access to the covered bridge. It would make the trail much more attractive.