Big spring run off always helps the early run in the rivers... not rain floods.. spring run off.... In the case of the Merrimack river, those fresh water currnets extend farther into the bay( Gulf of maine), thus turning fish inward that may migrate farther north bypassing the river alltogether... another benifit, is that alot of early fish ride the high water farther upstream an on the heels of the herring and shad....these larger fish tend to linger longer, and resist dropping back( because of higher water levels) until the last of the herring ( that do not die) return to sea, ususaly by the second week in July, without a good spring run off, these early fish usualy make a quick pit stop or pass the river by altogether...these big run offs are what provide good fishing far inland up to the dam in Lawrence..
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