How should I prepare for potential flooding in Utah and Arizona?

Upvote:2

That's a pretty ambitious trip you have planned. How long are you going for?

The Narrows are dangerous in bad weather but Zion National Park will have very good weather reports and info as to whether it is safe to go into The Narrows. The rangers probably don't allow entry if there is any risk. There is plenty to do in Zion if you can't go into the narrows so don't worry about prebooking. Actually, it is a good idea to book as early as possible here, even for campgrounds, because it is a very popular area.

Not sure about Havasupai; haven't been there yet.

If I were you, I would save Monument Valley for another trip, and add Bryce and the North Rim of the Grand Canyon (instead of the South Rim) on the Zion part of the trip.

On the way back to LA, if you drive through Las Vegas take some time at the Valley of Fire State Park. If you go that way, the Mojave National Preserve short Rings Trail is excellent.

More on flash flooding: Main roads will have bridges over "washes" that can flood and you will drive over these in good weather and wonder why in the world such a long the bridge was built over such a small trickle of water.

Upvote:4

If you're in a canyon or gully and it starts raining hard (> 5 mins), get to higher ground ASAP. This should be obivous, but perhaps not. Most serious trouble from flash flooding come from people camping in a gully and some distance away, the rains come off a mountain in a flood. Preventing this is a bit harder, but still not difficult. Look around for rainstorms on the horizon, especially on nearby mountains. The rain can saturate the ground and rush down the channels on the mountain, flooding gullies even miles from where the rain fell.

In short, keep your eyes open, watch for rain.

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