Last year, I found two more of his fantastical creations, Twisted Sisters, on the campus of Wheaton College in Norton, MA, and So Inclined at Middlebury College in Middlebury, VT. Twisted Sisters was erected in September of 2008. Due to the temporary nature of these structures, there's a good chance neither one is still standing. And, at the very least, if that guess is not true now, it will be soon. However, his website is a good source for pictures of his past works and for learning where new works are being installed.
Other OTIS visits to Patrick Dougherty sculptures: