This was from my just completed trip to Arches/Canyonlands. The clouds were pretty impressive on this trip out......so spent the days chasing them. The green river overlook is in the Island in the Sky district of Canyonlands NP.
Canonn 1D Mark lll with the 17-40mm lens at 25mm for 0.6 seconds at f22 and ISO 100. All tripod mounted and the Singh Ray 3 stop Grad ND filter and the Reverse Grad ND filter stacked.....HH in front of lens. Saved at 67 quality.