Zion's Facebook news feed reports that the Narrows is currently closed.
"The Narrows, and all slot canyons that drain into it, are currently closed due to high water from snowmelt. They will reopen when the flow rate of the Virgin River drops below 150 cubic feet per second for 24 consecutive hours. Once it reopens, the river will be cold, swift, and deep. Monitor the river flow at http://go.usa.gov/TQhx."