I had to find a link to confirm what we were told, and it is indeed a true story.
"The head of a sugar plantation in the area blasted that blowhole apart back in the 1920s, on account, its salt spray was damaging the crop. This bygone bigger brother to the Spouting Horn could apparently send up spray a couple of hundred feet high!"
https://hawaiianislands.com/kauai/things-to-do/spouting-horn/