Our distances are not driving distances, but are calculated as a 'straight-line' (or point-to-point) distance from Council Bluff. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line from Point A (ie- Council Bluff) to Point B.
Our distance measurements begin at a specific point in Council Bluff. The point that we are using is located at these GPS coordinates - Latitude: 34.5868, Longitude: -85.6733 [Map]. In this case, the coordinates for Council Bluff have been provided by the Geographic Names Information System (GNIS).