I can tell you from first-hand experience that Civil Engineering has a great demand for CA skills. In fact CAD drafting is a major department of most civil consulting firms. You can gain good CAD skills with a year or two of training, the latter from a technical or community college. Of course the pay is not as good as for Engineers who must complete a minimum of 4 years of college and eventually obtain a professional license. Basic CAD skills are also expected of newly graduated engineers as they often draft up preliminary engineering concepts.
Pete Sturtevant, PE