Bass, particularly largemouths, are like humans–they want "air conditioning." That means shade, current, oxygen, or all three. In shallow water, they're likely to hide in the thickest cover, such as grass mats, hiding from the sun's rays. In deeper water, they'll be wherever they can expect to get the full benefit of a flow. Sometimes, they don't hide at all but follow pelagic baitfish around the lake.