This little trail was worth the stop just to see the cast iron lift bridge and North Dakota’s only tunnel. Trail has portajohns at beginning parking lot and is paved to bridge. The bridge surface was expanded metal over railroad ties and crosses the Yellowstone River. The trail turns to sand thru the old wooden railroad tunnel. Make sure you have a light since it gets dark in the middle but entire tunnel was dry. Short trail afterwards has a nice view of the valley but ends on private property.

This is a remote area and trail is not used much. I saw one track made since the last rain. Bridge is fine to ride over with a little jump at the west end. I never imagined a lift bridge in this area.
The tunnel curves and after a 100 yards the entrance is no longer visible, so it is totally dark. I was alone, and even with a good headlight I got spooked and turned around. I spoke with a local fisherman who said the tunnel was open all the way.
The adjacent park isn't maintained very well, but looks safe.