Summary

Portrait of David Josiah Brewer David Josiah Brewer Monongahela Navigation Company v…

Congress has the same power to regulate commerce upon the land as upon the water. A river, to be sure, is a natural channel; but, if it is not a navigable one, it can no more be used for the purposes of commerce than the land, and therefore to convert it from the mere natural channel into a public highway, for commercial purposes, and to levy a toll to reimburse the expense, no more conflicts with the powers of congress over the commerce of the country than the construction of a canal or a turnpike for the same purposes, with the same tolls.
Source: Wikisource

Portrait of David Josiah Brewer David Josiah Brewer Monongahela Navigation Company v…

Hence, to measure the damages by the mere cost of building the bridge would be to deprive the company of any compensation for the destruction of its franchises. The latter can no more be taken without compensation than can its tangible corporeal property. Their value necessarily depends upon their productiveness. If they yield no money in return over expenditures, they would possess little, if any, present value. If, however, they yield a revenue over and above expenses, they possess a present value, the amount of which depends, in a measure, upon the excess of revenue.
Source: Wikisource

Portrait of David Josiah Brewer David Josiah Brewer Monongahela Navigation Company v…

It is only when, in the judgment of congress, its action is deemed to encroach upon the navigation of the river as a means of interstate and foreign commerce, that that body may interfere and control or supersede it. If, in the opinion of the state, greater benefit would result to her commerce by the improvements made than by leaving the river in its natural state, and on that point the state must necessarily determine for itself, it may authorize them, although increased inconvenience and expense may thereby result to the business of individuals.
Source: Wikisource

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