If offended, check title again ;)
Just as a matter of interest I had a wee look at the GPS track and checked out the elevations we climbed to when visiting the dams. We didn't really get up that high - maybe that fog made it look like we were mountain climbing.
With a bit of mucking around I managed to work out roughly where the dams are and as you can see the picture shows both our trip in and out giving a rough mirror image.
Oh, and lookee what I found on NZ Topo Maps: