The map below is pretty useful because you can see where the makers took out the old highway, so it is a good comparison between the CRH and the US 30 "upgrades."
A couple old loops survived east of Tanner Creek until US 30 was expanded for I-80N.
Includes ... Bonneville Dam ... Bonneville Locks ... Bonneville Reservoir ... Bonneville Power Administration (BPA) ... North Powerhouse ... Fish Ladders ... Salmon ... Sea Lions ... National Register of Historic Places ...
http://columbiariverimages.com/Regions/Places/bonneville_dam.html