Tracking studies have verified that river largemouths make major spring migrations from wintering areas to shallow backwaters. Though miles may separate these habitat zones, fish unerringly arrive once ice has departed. In these shallow murky bays, look for the thickest available cover, including submerged grass, fallen trees, or emergent weeds. Cast or pitch tubes or lightweight jigs into any spots with cover, even those less than a foot deep. Work the area slowly, as bass don't feed heavily until waters warm into the upper 50oF range.