The county highway commission is hereby authorized and empowered to receive, and expend, in the construction and maintenance of county highways, any money or property that may be appropriated or donated by any municipal corporation, special road district, township, or private individual, and to use and employ whatever means, methods, or power, that may be necessary in the construction and maintenance of said county highways, including the power to build culverts and bridges, for which purposes the county highway commission is hereby empowered to employ such technical and other help as may be deemed necessary for the administration and enforcement of this chapter.