The Crooked River is a good one now, but it is certainly possible to see a dip in action mid action when the sun is high and beating the water. The cool thing about the Crooked is the tall canyon walls combined with tall ponderosa pines along the edges of the rivers. These cast strong shadows across the river in many places and indeed these shadows attract fish often right after forming. 
PMD’s have been the main hatch. Look for some caddis later in the day plus Mahogany Duns, Midges, Hoppers and Attractors (Renegade, Royal Wulff, Purple Haze). 
The Crooked is always one of our best nymphing rivers and that is the same this week too either euro style, indicator work or hopper/dropper.