In the summer of the year, after the spawn has been completed and as water temperatures begin to rise its time to start looking for smallmouth bass in lakes off the bank. Some of the best locations to find smallmouth bass in the summer are offshore humps, which have deep water on all sides of them.
Current also becomes a very large factor to locating summer-time bass. Often times the wind can squeeze current between islands and the smallmouth will be set up to ambush the baitfish as they are funneled.
Having a good sonar, or side-scan sonar are critical to finding offshore smallmouth. Once schools of bass are located the lure choice is a much easier problem to solve. Smallmouth are very aggresive by nature, but you have to be around fish to catch fish.
In some lakes smallmouth can suspend under baitfish like smelt, so if you see marks on your graph that are not on the bottom they could still be smallies. Try topwater baits or even spinnerbaits to call the fish up to your lures.
In other lakes the smallmouth will be located close to the bottom and feeding on gobies or crayfish. Try to cast a carolinia rig, dropshot or jig.