bob, casey tango here. i did the narrows & temple runs last year, and scouted LDS falls. looked a little low to drop. temple run has better rapids and is a little harder than the narrows, and is logistically much easier, but short. the narrows is slow moving until the deep creek confluence, full of wood, but well worth it as an overnighter. the waterfall goes even at very low flow.
i'm in AZ and will be on the Salt for the next couple months. might be able to make it into utah to fire some stuff off.
hit me up.