The Colorado
The grand ditch through Grand Canyon.
The river
The Colorado is a plumber's nightmare and a paddler's cathedral — big water that drops a vertical mile through 277 miles of red rock.
The beta
length 277 mi class IV season Apr–Sep gauge check before you go
How to run it
Put in at Lees Ferry, read the gauge at the Diamond Creek take-out, and give the big ones — Lava, Crystal, Horn — their space. It's a multi-day, no shortcuts.