navigable waters

noun plural
nav·i·ga·ble wa·ters | \ ˈna-vi-gə-bəl- \

Legal Definition of navigable waters 

: waters that are capable of being navigated (as for commerce) and to which federal admiralty jurisdiction and specific environmental regulations apply it is the national goal that the discharge of pollutants into the navigable waters be eliminated by 1985U.S. Code

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