What's That Bug? does not endorse extermination

Okay, this bug was huge!! What is it?
Hello!
I saw this critter on the side of the Virgin River in Zion National Park in southwestern Utah, heading for the water. What is it? Unfortunately, my picture came out blurry, and I didn’t put anything in the pic for scale, but he was about 4-6 inches long. My coworker guessed it was a beetle larva. Thanks!
Sarah

Hi Sarah,
This is a Hellgrammite, the larva of the frightening looking, but harmless Dobsonfly.

What's That Bug? does not endorse extermination

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