Where do you think bass go in muddy murky water?  Water had less than 6" of visibility and heard this lake stocked channel catfish a week ago.

I figured the bass would stay tighter to cover so I casted shallow into weeds, tules, and into rock piles with soft plastics only. I casted out into dropp offs as well but not a single bite. I am using high contrasted baits in dark brown, black, blue.

About a dozen of boats were out as well and no one was catching. I saw them casting top waters, blades, plastics, etc. Everyone looked stumped out there.

I would use a big blade spinner bait, buzz bait or a whopper plopper or a bladed jig or a square bill with a knocker in it or a rattle trap or something that gets their attention and is fairly easy for them to track. Target, shallow areas and heavy cover and try to get your bait to make contact with whatever cover is available.

What pat said, but just know that for the first week or so going from crystal clear to murky (either from mud or algal bloom) they get tough. It’s like someone turned the lights out for them and they don’t like it.

What Pat said, and hit that stump MULTIPLE times.

In addition to the vibrations suggested above I say try some flash and color. Spinnerbaits, underspins, pearl white soft plastic flukes all have helped me. With really murky water I find working a slow retrieve is good, as it seems to give the bass time to notice, locate, and bite your lure.

I think they move tight to structure.

Everyone has given excellent advice for these conditions, however I will just mention from experience that a recent stocking of fish can have a massive impact on the bass bite. I have no idea if it works that way with catfish stocking. I've never tried to fish a lake after catfish stocking, but I HAVE fished numerous times immediately after saugeye, walleye, and trout stockings.

With saugeye and walleye stockings I have loaded the boat with bass by 'matching the hatch', starting right at the dump point, and working my way out into the lake in all directions while carefully fishing every single piece of structure/cover. With trout stockings I have NEVER caught a bass with this technique. I have intentionally planned to fish saugeye stockings. It's a predator-eat-predator world under the water.