In March commence the thaws of the southern borders of the zone of snow and ice; and during April, May, and June, it reaches to the most distant tributary fountain head. The river now is at its highest. The reverse then sets in. All the tributaries have their excess, the heats of summer are at hand, drought and evaporation soon exhaust the surplus of the streams, and the river is at its lowest.
To meet the great annual excess of water in the Mississippi, nature has provided sure safeguards. These are termed bayous, and are found everywhere along the river, below the mouth of the Ohio. Additional preventives against inundation are the lagoons, or sea-water lakes, of the coast. Into these bayous and lagoons, as the river becomes high, the excess of water backs or flows. They are natural reservoirs, to ease the rise, and prevent the inevitable suddenness and danger which would result without them. In these reservoirs the water rises or falls with the river; and when the fall becomes permanent, the water in the bayous-the lagoons having outlet into the sea-falls with it, returning into the main stream, and finding entrance into the Gulf, from which it had been temporarily detained.
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