The road is gated 3 miles from the top, so traffic was pretty light most of the way, and then non-existent.
I thought Marblemount was about 1,200 to 1,500 feet above sea level. Turns out it's more like 300. The trailhead is 3,500 feet ... I thought this was going to be a breeze.
I was real glad to have a water filter.