Use sunset as your turnaround alarm.
This is a narrows walk with none of the usual costs. No permit, no wading, no climbing, just a flat gravel floor running between walls that climb hundreds of feet straight up. The floor is the drainage, which is the whole point and also the whole risk: the Park Service calls Grand Wash a narrow, steep-walled canyon subject to dangerous flash floods that often arrive with little warning. Check the forecast, and skip it if rain is anywhere in it.
Flat gravel wash through 500-foot narrows. Watch weather - flash flood country.
Water bottle, sunscreen, hat, snacks, comfortable shoes.
Make it a weekend: Fruita Campground (Camping, 2 mi) · Singletree Campground (Camping, 15 mi) · Boulder Mountain Lakes (Fishing, 22 mi) · Fish Lake (Fishing, 33 mi)
More hikes nearby: Hickman Bridge (Hike, 2 mi) · Cassidy Arch (Hike, 2 mi) · Navajo Knobs (Hike, 3 mi) · Capitol Gorge & The Tanks (Hike, 5 mi)