MOAB, Utah -- The Potash Scenic Byway snakes south of town along the muddy Colorado River past ancient rock art, dinosaur tracks and stunning red rock walls. The road ends at the Intrepid Potash Mine, where brine is pumped into two massive evaporation ponds that shimmer in the desert sun. Whether the 400-acre brine pools -- vital to producing potash, an ingredient in fertilizer -- befit a "scenic" highway depends on who's looking. Some who see them from high above on the canyon rim say the turquoise pools look like shiny desert jewels. Others say they're a blight on the pristine landscape.