http://www.washingtonpost.com/sf/sports/wp/2015/11/23/running-up-the-bills/?tid=sm_tw
This article reports that (after reviewing FOIA records), in 2014, Iowa ended $3.0M in the black with $105.3M in athletic revenue and ISU ended up $1.8M in the red with $66.2M in athletic revenue.
ISU increased its athletic revenue by $36.8M from 2004 to 2014.
Iowa increased its athletic revenue by $43.1M from 2004 to 2014.
I found it interesting that 7 of 14 B1G programs ran a deficit in 2014, 8 of 10 Pac-12 programs (2 are private institutions immune from FOIA) ran a deficit and every ACC program ran a deficit.
Finally, Oregon's FOIA response identified $193.9M in athletic revenue - outpacing the nearest competitor by more than $30M.