Transient parking is now on the outer ramp northeast of the mushroom.
Just ask HIO Ground for directions.

For those familiar, the parking area to the east of the mushroom and
just outside the terminal building has been given over to the Intelonion
Shuttle jets.

For those not familiar, "The Mushroom" is a structure built many years
ago to provide a rain shelter for passenger loading and fueling. Though
it hasn't been used for that purpose for a long time now. Mostly, you
see Hangar 53 parking their fuel trucks under it.

--
-Mark