Hi Jim,
Welcome !
Yes, the floods, the flooding rains, the droughts .... the contrasts.... Neil's right .... a teamster basing his family in Wellington could have be lost in the 1850s just about anywhere even into Queensland, or down across the Murray in Victoria or over in South Australia .... or he may have been killed in a mining accident on the gold fields, or succumbed to measles.
May I ask if anyone has checked the actual parish registers for a marriage of John WARD to see if there's any 'clues' recorded by the reverend about John. Sometimes a 'ship of arrival' may be mentioned there. Also, if John Ward's wife was a regular churchgoer in Wellington, perhaps the clergyman kept a 'family sheet', or prepared a new one for Judith Ward's next marriage ..... These came in very handy for those clergy on 'circuit' in the sparseness of western and far western NSW.
By way of explanation .... C of E clergy were often keepers of 'family sheets' of information on their 'flock'. And, at RChat's NSW Resources Board there's live links to the ones for up around Newcastle NSW .... now obviously Wellington's C of E 'family sheets' would not be held by the Newcastle Diocese, but perhaps the Bathurst diocese office may know of their location?

Here's the link to the NSW Resources Board
http://www.rootschat.com/forum/index.php?topic=369703.0and here's one of the links to the Christ Church Cathedral's digitised registers:
Baptisms, Marriages, Burials, Christ Church Cathedral, Newcastle
http://www.flickr.com/photos/uon/sets/72157606066769147/ 1820 – 1899 Family Register
JM