Lake Powell

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10. Varies by location - the original gradient of the Colorado was 2' per mile . . .

Maximum depth was about 550 feet at the face of the dam when it first filled in 1980 (and it took 17 years to fill the reservoir).

It was designed with capacity of 27 million acre-feet. It's now down to about 25 million acre-feet capacity, though that's at full pool, which is hasn't hit since the 1990s.

In terms of water it's actually storing now, it's about 7.2 million-acre-feet, so less than one-third of remaining capacity.