Me and my son walked this trail recently. We walked all the way to Boulder Dam which was almost a 4 mile walk each walk if I'm correct. There is five old railroad tunnels that you walk through which is nice, but some have a strong odor of bat urine/feces which was kind of gross. I definitely wouldn't recommend this walk between June and September because it's just too hot and heat exhaustion is inevitable if you don't go early enough. Can't wait to do it again when it cools down though!