put out a trot line where u seing them and bait it with minows ans small craw fish. 9 out of 10 u well catch him by the feet. good luck.

Make yourself a wire turtle trap and bait it with just about anything dead. You'll catch them along with all the sliders and snapping turtles you want to fool with. I prefer this way over a trot line because you can release what you don't want without harming them. Be careful picking softshells up - they got a really long neck.

Describe a wire turtle trap. Should I maybe modify a crab trap

You're on the right track. A turtle trap looks like a bigger version of a crab trap, made out of thinner wire. Also, keep in mind, if you go with the trot line idea, you'd have to run them pretty regular to make sure your turtle didn't die on the hook and not be edible.

If you have steady water table, You can also just hammer in stakes near the shore in an upside down (W) shape. With the tall ends towards the waterline. throw some bait in and you will catch whatever size you have the opening at.

I'm gonig to try the trotline idea 1st. You think I should use treble hooks, since you normally foul hook them anyways?