The trail winds in and out of a creek, and the main attraction is a circular tunnel section in the middle that looks like a subway tunnel; hence the name. The water is pretty cold; about 45 degrees but it was quite refreshing as the day grew warmer. In total we hiked about 6 miles (I think) and we had a great time.
We all wore board shorts, compression shorts, rash-guards and water shoes because we were in and out of the water a number of times on the hike.
At the "end of the trail" where we started our hike
One of the cars parked at the trail head had this bird stuck in the grill
Pretty but steep and scary because of the loose gravel on the trail
Getting to the bottom of the canyon
These are dinosaur tracks that have been preserved in petrified mud. The trail runs right below this spot
Lots of pretty scenery. The sun hadn't reached the bottom of the canyon yet
There were several spots where the sedimentary rock created stair-like waterfalls. It was much easier walking up the creek than on the trails at the side. We all wore water shoes for the hike. Sometimes there was moss on the rocks that made for slippery walking. The more daring among us did a little water sliding, but I declined
In the lower distance you can see the entrance to the subway section of the canyon
The bottom is slick and has deep pools along the bottom. It was actually pretty cold down there