By 1700 the Virginia frontier had been pushed as far west as the fall line-the point upstream at which the rivers emptying into the Atlantic became unnavigable.
And rural migrants took up bamboo poles and skeins of rope to join the so-called "stick-stick army" of porters, looking to haul bags of groceries or sacks of concrete mix along unnavigable inclines.
Sitting on an unnavigable river in a valley of middling agricultural productivity, the city has been forced to prosper on ingenuity: fine craftsmanship, creative banking practices, slick diplomacy.
When the one chair in the room was at its usual place before the table, the canal was unnavigable.
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