Sorry you didn't score better. Were you fishing out of your own boat or a rental? The reason I'm asking is that I want to know if you had an anchor onboard or not? This is important as I will try to explain.
Right now the big females are either in the spawn or post spawn period up there. Personally, I don't target bedding bass, but I'll tell you this for sure - if you can see them.....they can see you! And they will immediately shut down. Only the smaller males on beds will remain to defend the nest. They can be caught as well, even when visible. Cast beyond the target bed with a drop shot and slowly drag it into the nest. You'll get bit.....every time.
The big females move out right after spawning. These fish chase the schools of smelt and yellow perch around deep water (25' - 45') structures, such as humps, drop offs and river channels. You need to use your sonar NOT to find fish.....but rather to find BAIT. This is paramount. If you find bait on structure up there, you need to anchor up on that structure and fish a drop shot and/or Senko, fan casting the area. Stick around for at least a 1/2 hr. on any given spot. The smallies will be by, chasing bait. They roam constantly. They do not hold still by any structure. Which is why an anchor is so important to success. Let them come to you.
After about a 1/2 hr., if nothing, move and use your sonar in search mode again. Looking only for bait on a structure. The bait balls will drift in & out over the structure, but will be pretty close to it. This is what the big girls look for. Well, that's enough for now. There's a lot more to it, but let me know the next time you are heading up there and I'll try to give you a couple of spots to try.