Image via Google Maps: g.co/maps/8brdy
Estimated server count: 241,280
This data center was announced by Google in early 2007 and became operational in early 2009. It looks the same size as The Dalles but housed in a single building instead of two. I am guessing the building is densely packed with containers - leaving space in the middle for cooling machinery.
Return: All Google data centers
Google's own page about this data center: google.com/datacenters/council-bluffs