Productive spots are found throughout the stream. The heads and tails of pools are always reliable, where fish station themselves to feed on food drifting through the current. Seams where fast and slow water meet are prime lies. Undercut banks, especially those with overhanging vegetation, provide cover and a steady supply of terrestrial insects. Deep pools carved out by the current around large boulders or bedrock ledges often hold the largest fish. The confluence areas where smaller tributaries enter the main stream are nutrient-rich and attract feeding trout.