Still amazes me how huge those things have to be to get a shuttle to escape velocity. So glad we're making progress with spaceplane technology. Hopefully a cheaper, more efficient delivery system will mean more public interest in space operations, now that the opponents can't spin the money side quite as much. (I actually wrote an essay in college detailing NASA's funding, and it was a literal drop in the bucket compared to everything else that gets allotted money yearly. Quite sad, actually.)
Length: 154 ft
Diameter: 27.5 ft
Weight (empty tank): 65,000 lbs
Total Weight (Propellant + tank): 1,694,577 lbs
This ET (ET-94) was built for flight, but never used.
According to one of the volunteers on site after the Columbia loss from pieces of the foam insulation damaging the tiles on the wing leading edge this tank was used for study of the problem. That's why there are sections of foam missing.