We have several streams that produce great Arctic Grayling fishing. One in particular, not only produces high numbers, but it also produces Arctic Grayling of a very large size. Last summer we routinely caught many in the high teens in length, quite a few over 20 inches, and one that we had to put the tape to that measured 24 inches. Arctic Grayling will at times hit almost any small dry fly. They also take egg pattern flies, especially after the salmon start to spawn.
Small spinners work very well also.
Arctic Grayling, though not large, put up an entertaining fight. They can be caught mixed in with the salmon, but in order to catch a lot of them, you will be required to walk up shallow and rocky streams while casting in the deeper pools, behind large boulders, and under overhanging banks. We have many miles of prime Grayling fishing in our area. Dolly Varden enter the rivers in early summer and migrate up the systems into smaller streams. They are found in the same general waters as the Rainbow Trout and are often caught while Rainbow fishing.