The law of water rights in the United States has been for the most part regulated by the several states, subject, however, to the power of Congress to regulate interstate and foreign commerce, (which includes the control of navigation and of navigable streams in the interest of commerce) and to the control of the United States over waters on public lands and rivers on the international boundaries. The laws of the several states show considerable variation; but in respect to the use of water power, they have until within a few years been based mainly on the protection of private rights and public safety, without establishing any public control for economic reasons. In the mountain and Pacific coast states there has been a large degree of pub...