Summary

Joseph P. Bradley Parkersburg Ohio River Transp Company v…

The Port-wardens, 12 How. 319:
'The power to regulate commerce embraces a vast field, containing not only many, but exceedingly various subjects, quite unlike in their nature; some imperatively demanding a single uniform rule, operating equally on the commerce of the United States in every port; and some, like the subject now in question, [which was pilotage] , as imperatively demanding that diversity which alone can meet the local necessities of navigation.
Source: Wikisource

Joseph P. Bradley Parkersburg Ohio River Transp Company v…

By this we mean that until the local law is displaced or overruled by paramount legislation adopted by congress, the courts have no other guide, no other law to administer on the subject, than the local or state law. Our system of government is of a dual character-state and federal. The states retain general sovereignty and jurisdiction over all local matters within their limits; but the United States, through congress, is invested with supreme and paramount authority in the regulation of commerce with foreign nations and among the several states.
Source: Wikisource

Joseph P. Bradley Parkersburg Ohio River Transp Company v…

It is undoubtedly a general rule of law, in reference to all public wharves, that wharfage must be reasonable. A private wharf that is, a wharf which the owner has constructed and reserves for his private use-is not subject to this rule; for, if any other person wishes to make use of it for a temporary purpose, the parties are at liberty to make their own bargain.
Source: Wikisource

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