I've done it at close to 9'
It's truly the gnarliest thing I've ever hit in a loaded boat. For reference, we tied up to the hand rail at buckskin bills two days later, about 6" of exposed rockwall, no beach.
The left to right lateral is very deceptive. I was the last of four boats, our plan was to avoid the rapid and punch the lateral as close to river left as possible. I watched all three Infront of me get turned sideways and typwritered into the gut faster than I thought possible. 3 very near misses including one ejection and self rescue that was a testament to will. I posted a pic a few years ago of that one.
I backed off and hit the gut with as much speed as possible, buried my boat to the oars, and managed my way through. It was like driving into a wall at 30mph.
I'm told by a buddy that used to outfit on the main that the move is to line across the lateral with a 3:1 and BOMBPROOF anchors at very high water.
It's a high consequence rapid at high water.
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Never get out of the boat