I'm not too sure about this particular Liard, but I did find a Liard family that settled in St. Paul, Oregon around that time. You'll find several Liards listed at Old Saint Paul Roman Catholic Mission Cemetery at FindAGrave (link here).
Among them, there's a Thomas Stanislaus Liard that seems to correspond fairly closely to the Stanislas Guyard profile you manage. Compare the info from Oregon's Secretary of State office here to the Drouin record in LAFRANCE and the parents are a match (though his mother's name seems mistranscribed in Oregon). There's also record of him having a child named François Xavier on 5 May 1847 (link here).