(a) The legislature consents to the purchase or acquisition by the United States, including acquisition by condemnation, of land in this state made in accordance with this subchapter.
(b) The United States may purchase, acquire, hold, own, occupy, and possess land in this state that it considers expedient and that it seeks to occupy as a site:
(1) on which to erect and maintain a lighthouse, fort, military station, magazine, arsenal, dockyard, customhouse, post office, or other necessary public building; or
(2) for erecting a lock or dam, straightening a stream by making a cutoff, building a levee, or erecting any other structure or improvement that may become necessary for developing or improving a waterway, river, or harbor of this state.

(c) During condemnation proceedings for the acquisition of land by the United States under this section, the United States may occupy the land and construct improvements on the land immediately on the filing of the award of the condemnation commissioners with the condemnation court, without awaiting the decision of the court, if the United States deposits an amount equal to the amount of the award of the commissioners plus the amount of all costs adjudged against the United States.