Sea-run cutthroat start to move into the Quillayute system this month, and they are great sport on a fly rod. Marabous, Muddlers, and Krystal Buggers are good fly choices for sea-runs. Dolly varden are another option. Look for quiet pools and shady water.
Some resident trout are also available in the Sol Duc. They can be taken with attractor flies such as a size 12-14 Stimulator with an orange or yellow body, a Royal Wulff (for rough water), a size 14-16 Parachute Adams, or a size 12-16 Elk Hair Caddis.
The Sol Duc has more insect life than the Bogachiel and Calawah. You can find hatches of golden stoneflies and caddis this month, and even some green drakes. In addition to the dry flies listed above, stonefly nymphs such as Kaufmanns Stonefly will take trout. Cased Caddis patterns in size 8-16 are also a good choice.
Steelhead are present, and you can have decent fishing for them until the river drops to a low-and-clear state.
For more on July tactics and flies, see the Rivers in General forecast