During springtime, stocked trout in lakes and reservoirs can be found fairly shallow, feeding in the upper 10 to 15 feet of the water column. An effective technique to catch spring trout is to troll with crankbaits, either longlining directly behind the boat or with planer boards. Troll with 10 to 20 feet of line out at a speed around 2 mph. Cover a lot of water, and focus on high-percentage areas including steep drop-offs along mainlake shorelines, around sunken islands, saddles, and points.