Adding one of these would be so Holiday World. We know how much they love their water coasters and they have basically every type of water coaster concept except this one.
Coming back to this after nearly a year. Looking at the construction site and teasers, I'm going to predict that this is going to be some sort of Mack Rides Water Coaster. The teaser website seems to hint at some sort of water attraction with the "boiling water advisory". In addition, the trough that has been constructed seems to be similar to the troughs that are used for Mack Water Coasters.
If it does end up becoming a Mack Rides Water Coaster, it would be the first in this region of the United States. There are only two traditional Mack Rides Water Coasters in the country, both of them being Journey to Atlantis at SeaWorld Orlando and SeaWorld San Diego. It would also make sense for Holiday World, as they label themselves as the "Water Coaster Capital of the World", although this type of Water Coaster is different from the water slide variants.
Teaser website from Holiday World: https://www.townofbouldercanyon.com/
(Trough picture comes from ParkFans)