http://www.globalsecurity.org/security/systems/mexico-wall.htm
That is NOT where I heard it.....I heard it from Michael Medved.....FWIW
From your link:
As of 2005, just over 80 miles of federally enforced barriers and fencing were at strategic points on the border, mainly in Texas and California.
This seems to refer to the few miles of existing fence. The law signed in Oct 2006 called for an additional 700~854 miles of new fencing. From what I've read, only 2~11 miles of that fence has been completed.