Dan wrote:
There are some places on IFR enroute charts where the OROCA (Off-route
obstruction clearance altitude) is actually lower than MEAs on an
airway in the same quadrant. The higher MEA is NOT due to obstacles in
adjacent quadrants.

MEA's are often higher because of the signal issues of the NAVAIDS
involved. We got an airway here with a 9000' MEA which is way higher
than the obstructions and the MVA because there's something wonky
with the VOR that defines it.