The Snake River near Pullman is loaded with SMB. I have caught good SMB from the Salmon River down to the Tidewater near the Ocean. LOL You even have great SMB in the Grande Rounde River, South and West of Clarkston, during the Summer. Just watch out for Rattle Snakes in the GR.
If you are from MN, then just fish the SMB like you are use to, just remember the water is not as clear.
In Idaho, Dworshak is the Premier SMB fishery in the West, maybe the world. Due to a Federal Judge, the way the water is managed in Dworshak has changed and the SMB cannot spawn as well as they use to, and it has impacted the Kokanee they feed on, but ......... at one time I believe that the next world record was just a cast or two away. Larry Dahlberg, a friend and Hall of Fame fisherman, once claimed that the next world record was in Dworshak as well, but again, think Federal Judge (something about flushing Salmon and Steelhead smolt to the Ocean by doing a water dump right during the SMB spawn).
The two locations I have given you could keep a permanent smile on your face once you learn them.
Now, Rock Lake. The problem is not just the launch, but the launch is a big problem. I tow two to three boats off Rock Lake every year, and we lost a Kayaker a couple of years ago (hypothermia) , and almost lost two young adult fisherman as well. I admit that I know every rock and obstruction on the lake, and have paid for that knowledge with props. During much of the winter and spring, the lake has very little visibility so the rock shelf that are often only a few inches to a couple of feet under the water are unseen until you hit them. I know of a lot of those area where your depth finder shows 300' and your nose is run aground; you may still be 30 yards from shore. Other times your depth finder may show 300, your nose is against the cliff face; you have 300+ feet of rock straight up. Once in trouble, there is little area to land your boat and get out.
I have an 18' Lund Style that I put on there, but during the Summer (seldom fish the summer), I need my 4WD truck, I drop the real axle off the ledge to float my boat, then I need to drag my trailer back over the ledge edge. Now, if that is something you don't mind doing, then yes, it can be done.
Rock Lake is known for Brown Trout. I assure you that there are Brown Trout in there that will compete in size and strength to the Bass you are familiar with. Yes, there are some nice Rainbow in there as well, but they are so much easier to catch that most never get a chance to grow. As for Bass, I have only caught Large Mouth Bass in there. I don't know why SMB are not in there because I am positive that bucket biologist have put them in there. If I were to guess, it would be the lack of good spawning habitat and the lateness of the year that the water warms. The lake's extreme depth, relative small surface area, means the lake never freezes over. (OK, I did see a quarter inch of ice one winter for the lower quarter mile, but I broke a path with my boat and it was gone by the afternoon). On the other hand, it does not get warm until late in the year.
I believe that Bonnie Lake, upstream of Rock, is where the LMB spawn (along with crappie, perch, and bluegill), and the small fish flush down the creek during high water. Yes, some do spawn in Rock, but I found a bunch of LMB Fry last fall (October) that were only 3 inches long, so little chance of winter survival. That does not mean there are not good LMB in Rock.
I have caught several LMB up to 8 pounds in Rock, but most are 12 to 14 inches or less. Because of the different nature of Rock Lake, it is not the normal Bass fishery you are use to. Also, there are not Shad or Shiners, only Sculpin, sucker, perch, some bluegill and crappie, and a LOT of crayfish to feed them. Vertical cliffs, shallow ledges, etc....., make Rock a different type of summer bass fishery. I LOVE IT. OK, some planter Rainbows and Browns feed the Bass as well.
If you are willing to travel to Rock, then Downs is just a little farther and is much more of a LMB lake. Sprague Lake is just now coming on as a LMB lake, but due to a recent poising of fish to remove Walleye, the Bass are not as well known as the Rainbows that they out in there for the interim.
Welcome to the Pacific NW and just be patient. You will find that the Bass are alive and well in the area, it will just take a little time to locate them.
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