In CADDISFLIES he identified four major color combinations and several minor ones. If you know what species are common in your river you should carry pupa imitations to match them. My favorite for a searching pattern in this area is a brown and yellow pupa which has a body of golden antron blended 50/50 with brown fur, a gold or amber yellow overbody and a brown head. I'm not sure what colors would match the most common caddis near you.