Edward Douglass White, Phoenix Bridge Company v. United States…
“ When the fact that the bridge spanned a great navigable river, and the duty of the government to protect that navigability, is borne in mind, moreover, when the facts found by the court below as to the period when navigation would be suspended as the result of natural causes is also considered in connection with the obligation which the contract imposed of completing the drawspan within such nonnavigable period, we are of opinion that the contract must be interpreted as exacting that the means employed in constructing the drawspan should be such as would not operate to impede navigation. ”
