If you have a boat and you can find rocks or riprap, you can find smallmouth in Brownlee. Head downstream from the dam until you get out of the heavy current. There is a guide that fishes the outfall of the damn, but I would recommend a heafy boat to do that. Besides, fishing below dams scares me. Even the boat ramp at the dam has more current than I like to deal with in my boat. As for the guide, I don't know his name, but my brother fished with him and said he caught smallmouth on the wacky rigs until he got bored with it. We fished down stream from the dam as I mentioned and caught a lot of bass, but nothing like CJ. If I were to go back to Brownlee, I would fish by the ramp in the current for channel cats from the bank, or go straight across the river from the ramp in a boat, to a clear spot on the bank and again fish for cats. Be careful, that current can be dangerous by the dam.

I buy 4 and five inch Yamamoto senkos from Amazon in green pumpkin pepper. I have tried others, but just haven't been happy with the sink rate. They are a bit more expensive than some others, but to this point, their catch rate justifies it for me. I have used other colors, but in Idaho the pumpkin has worked best for me. Just a 1/0 hook on o-ring and 10 pound leader with no weights or swivels. Fish rocky areas casting to about a foot of shore and yo yo out. Lots of snags, but most can be recovered by moving the boat to just passing the rod over the snag and pulling in the opposite direction. Most snags are just caught in a V of two rocks rather than hooked into something. When I get to approximately 10 feet depth, I will often let the senko lay on the bottom for 5 or 10 seconds before lifting to let fall again. When I see the line move, I lift very gently to feel extra weight then set hook. If you miss fish, let senko fall again. Surprisingly, many of my bites are within a few feet of the shore. Be thorough. I have often caught fish on both sides of the same rock. When I see a very large rock under water, I will cast all around it.
I am not sure what part of Idaho you are in, but my most successful smallmouth lake in Idaho is CJ Strike. I have caught bigger bass at other locations, but you can't beat it for constant action. My favorite areas are the north end where the river comes in, but still in sight of the dam and in the narrows. If fishing the narrows, you will do best fishing the shaded side. Fish the narrows early as the crappie fishermen will start taking over the banks later in the day. If you are interested, the crappie fishing in CJ is outstanding with many monster fish in early spring on the opposite side of the narrows from the damn. I have also done fairly well on bass in Brownlee Lake using the same method.