Kodayar is a very bueatiful place. There is two stages for the dam. The upper dam is in trinelveli dist and the lower one in kanyakumari district. I went till the lower kodar dam. The upper was one mile above this. The only way to reach it is either through a "winch" or take a detour through tirunelveli (around 160 - 200 Km)
http://picasaweb.google.com/stanly.johnson/KodarLowerDam#
http://picasaweb.google.com/stanly.johnson/KodarLowerDam#