I fished the South Platte Tuesday below Pine Creek Road, and then moved up to just below Deckers. There was surface activity early, but I couldn't tempt them much. Below Pine Creek Road the water was clear, with very little moss/algae. Near Deckers the algae was so thick it was a struggle to keep the nymphs clean for more than one cast, and the water was almost murky. Anyone have an idea why the conditions would be so different just a few miles apart on the same river, with less moss/algae downstream?