The governing bodies of the several counties may condemn lands for the purpose of securing gravel, sand, clay, stone or other material for building and maintaining the public roads and highways within their respective counties, when and wheresoever necessary, in the manner provided by law for the condemnation of rights of way for roads. And they may condemn sufficient lands adjacent to or near any bridge built across any river of this State for the purpose of erecting a house there for the keeper or watchman of such bridge, such condemnation also to be as provided by law for the condemnation of the rights of way for roads.