AU, you might experiment with 200s and short line 'em...say 50' until you get comfortable with the area. You can always come back with more line or more lip (300s). Who knows, on a lake that shallow, there's liable not to be much of a thermocline if any at all....especially if it's wind blown or subject to current. If that's the case, the fish will be where the bait is and ignore the depth.

Then again, if it's vegetation laden or prone to free floating vegetation, spider rigging is likely to be more productive.

Wannabe...