I have not fished the Tucannon in the winter for steelhead, it's a 6 hour drive for me, but I have gone down for a long weekend several years in a row with 2 friends to trout fish. This is a fabulous trout fishery in the late summer and early fall (probably at earlier times too, I just haven't fished it any other time). The area where we fish we get to by going east out of Dayton on State Route 12. Just after it crosses the Tucannon, at about 15 miles out of Dayton, take a right on the local road that heads south toward the Umatilla National Forest and the Tucannon Wilderness. For about 10 miles this road runs more or less along the river without crossing it. The area I have fished starts where this local road first crosses the river, and for about two more bridges up river from there. I have fished all of the river between this first bridge and the third bridge and have had great luck on rainbow, and some steelhead juviniles. Large dark stonefly nymphs and wooly buggers, as well as caddis dries have been all the flies I've needed. We're talking catching fish until you just get tired of catching fish. The majority of the fish are to 10 inches. There are an enticing number of larger fish. In these stretches, I've fished over slots that looked as if they'd be great steelhead producers. As you can tell, I'm a big fan of this river. I have never seen it crowded on these weekend trips.
The Touchet is also well worth a try. With the same flies, I've found an occasional brown in that river (I lucked into an 18 incher last October), along with rainbows. The fishing is good, but not as good as the Tucannon, I think. I have fished it near Waitsburg to the east, but the access is not nearly as plentiful as along the Tucannon. I understand that it, too, has a good steelhead run.
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Tad
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Tad