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1. Sufficiently deep or wide to provide passage for vessels: navigable waters; a navigable river.
2. Capable of being steered. Used of boats, ships, or aircraft.

nav′i·ga·bil′i·ty, nav′i·ga·ble·ness n.
nav′i·ga·bly adv.
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Noun1.navigability - the quality of being suitable for the passage of a ship or aircraft
quality - an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare
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References in classic literature ?
A succession of navigable waters forms a kind of chain round its borders, as if to bind it together; while the most noble rivers in the world, running at convenient distances, present them with highways for the easy communication of friendly aids, and the mutual transportation and exchange of their various commodities.
In all the parts of the world washed by navigable waters our relation to each other would be the same--and more intimate than there are words to express in the language.
The EPA always believed its jurisdiction stretched beyond traditional navigable waters such as rivers and seas to the smaller bodies of water and wetlands that can affect them, but it didn't have a strong legal basis to prove it.
For the FAA project, Parsons designed and reconstructed critical airport approach lighting systems located within navigable waters at both JFK and GON that support nearly 1,200 flights per day.
Opposition to a federal rule that expands Environmental Protection Agency (EPA) jurisdiction over navigable waters without further clarification, a move that would massively increase the number of construction sites required to obtain a federal Clean Water Act permit and, in turn, increase unwarranted delays and construction costs.
In a change from the proposed rule, the agencies in the final rule also assert jurisdiction over wetlands adjacent to tributaries of navigable waters for the first time by defining how far they are located from a navigable water or its tributary.
For adjacent wetlands, the proposed rule added "adjacent waters" to navigable waters under the scope of WOTUS.
idea that navigable waters and submerged lands were held by the Crown in
Gaziano of the Pacific Legal Foundation, writing in The Wall Street Journal, say the EPA now wants to control not just wetlands and other non-navigable waters but any water or normally dry land with a ''hydrological connection'' to actual navigable waters.
The 1972 federal Clean Water Act makes it illegal to discharge pollutants into navigable waters unless the discharger has a federal permit.
At that time, the Supreme Court was still in a somewhat accommodating mood, so it held that in the Clean Water Act, "navigable waters of the United States" (13) could be read to refer not just to navigable waters, but also to adjacent bodies, which could flow into navigable waters.
69) It was not surprising, then, that many American courts inherited the English doctrine that riparian landowners held ownership rights to the beds and banks of non-navigable waters and limited, but still important, rights of access to navigable waters.