There are many species of caddis that hatch from our local rivers, but some are much more prolific than others. One kind has an olive to green underbelly and the other has a tan underbelly. Both have brown backs. In this family, all seem to be 16/18 size, and there may be color variations in the same family. During a hatch, there seems to be a fairly long period where the pupa drifts along the bottom of the river, then rises fairy swiftly to the surface, walking across the surface to the bank. Trout target these pupas as they are rising to the surface.
A proven presentation is to cast this type of fly quartering upstream and let it sink and drift along the bottom of the river. Then when the fly drifts to a position downstream of you, lift your rod tip slowly so that the fly rises to the surface. Trout often strike while the fly is rising. Many of the strikes are aggressive, and some are downright vicious. For that reason, tippets of less than 5X are not recommended. It pays to carry a shock loop, much like would be done when fishing for steelhead. This loop absorbs the shock of a strike and allows the fish to turn back toward the bottom before the hook is set. Both colors of the Bead Head Ascending Caddis have caught plenty of fish. These flies can be also be fished while suspended under a dead drifted dry fly.