I've found the area using the detailed maps of the Tasmanian Aboriginal Centre. See the newly edited location. The area is along a bend in the Jordan river. It appears to be mostly in livestock pasture, except for the northern edge, which has what appears to be a small railroad station (possibly no longer in use or only for freight?)
By the aerial and street views, the Jordon appears to have a varying breadth, probably depending on the season. The planned bypass bridge will cut across the valley south of the much smaller existing bridges, directly over the site, with the pilings and ballast disrupting the archaeological areas.
Something is not right. This message is just to keep things from messing up down the road