  Fermilab has had a very active long baseline neutrino program since
initiation of the NuMI project in 1998. Commissioned in 2005, the NuMI beam
with 400 kW design power has been in operation for the MINOS neutrino
oscillation program since that time. Upgrade of NuMI to 700 kW for NOvA is now
well advanced, with implementation of the beam upgrades to be accomplished in
2012-2013. Design development for the next generation LBNE neutrino beam is now
a major ongoing effort. We report here salient features and constraints for
each of these beams, as well as significant challenges both experienced and
expected.
