Anyone have a handle on how many adult bass (12"+) there are per acre in an
average lake?

Where? Varies greatly. I was told I could expect about 75 - 150 pounds of fish
per acre in an unfertilized pond up to about double that in a fertilized pond
here in middle Georgia. Even big lakes vary greatly.

And you can manage somehat for size. If you can have 50 pounds of bass per
acre, it could be 50 one pound bass, 25 two pound bass or 5 ten pound bass and
so on. Usually you have a mix, but you can manage for higher numbers of smaller
or bigger bass.
Ronnie

http://fishing.about.com