Bobbers or floats can work great when fishing the rivers and streams. Most anglers will be fishing with live bait when they use a float, however, there are several lures you can drift under a bobber too. You can also have a lot of success when fishing ponds and the smaller lakes.
Slip bobbers are very popular for live bait anglers when they are fishing for rainbow trout in rivers, ponds and smaller lakes. The slip bobber will help you get your bait down deeper. Just make sure to set the slip bobber at the depth you think the rainbows are feeding at and you should do well.