Summary

Samuel Nelson Pennsylvania v. Wheeling and Belmont Bridge Company…

We do not enter upon the question, whether or not congress possess the power, under the authority in the constitution, 'to establish post-offices and post-roads,' to legalize this bridge; for, conceding that no such powers can be derived from this clause, it must be admitted that it is, at least, necessarily included in the power conferred to regulate commerce among the several States. The regulation of commerce includes intercourse and navigation, and, of course, the power to determine what shall or shall not be deemed in judgment of law an obstruction to navigation
Source: Wikisource

Samuel Nelson Pennsylvania v. Wheeling and Belmont Bridge Company…

It is not taken away by the requirements of the act imposing on vessels the duty 'not to interfere with the construction and elevation of the bridge,' because those requirements are imposed for an object not intrusted to the general government, nor in execution of its commercial power; and they operate to tax the exports of a State, and give a preference by a regulation of commerce to the ports of one State, over the ports of another.
Source: Wikisource

Samuel Nelson Pennsylvania v. Wheeling and Belmont Bridge Company…

That at the date of the passage of the act of congress legalizing the Wheeling Bridge, the State of Pennsylvania had by the judgment of the supreme court of the United States, 'a just and legal right to have the navigation of the Ohio River made free by the removal of the bridge, or by its alteration,' in conformity with the decree entered in May, 1852.
Source: Wikisource

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