Summary

by John Marshall Harlan United States v. Rio Grande Dam Irrigation Company…

Evidently Congress, perceiving that the time had come when the growing interests of commerce required that the navigable waters of the United States should be subjected to the direct control of the National government, and that nothing should be done by any state tending to testroy that navigability without the explicit assent of the National government, enacted the statute in question.
Source: Wikisource

by John Marshall Harlan United States v. Rio Grande Dam Irrigation Company…

It is not a prohibition of any obstruction to the navigation, but any obstruction to the navigable capacity, and anything, wherever done or however done, within the limits of the jurisdiction of the United States, which tends to destroy the navigable capacity of one of the navigable waters of the United States, is within the terms of that prohibition.
Source: Wikisource

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