If you want 15-20 fish in a couple of hours (happens all the time), you'll have to wait for the smelt run to be over. They are full of smelt and there is plenty to choose from. After the run, they'll be hungry again. Otherwise, you have to move, move, move. Present your fresh bait properly and be patient. The volume of water does spread the fish out some, but they are not trying to swim the current, they are just trying to eat and relax (my vision anyway). When the river is blowing, look for softer water or fish the slack.

Someone once told me that when sturgeon are not sleeping, they are eating. And sturgeon never sleep.