This looks like the most appealing of the 856 footers I found:
Blue Valley Park in Kansas City, MO
Hole 18, Blue tee to Pin "B" = 856 ft
I have no clue if the pictured tee is the Blue tee, or which position the basket is shown in, but the sign reads 856 from the blue... interesting tee pads
I think we might be adding 857 to the missing list.