Neutron scans of an operating air water contactor were performed at the NIST Center for Neutron Research (NCNR). Averaged radiographs were used to determine local and average liquid holdup profiles in three stainless steel structured packings (Sulzer Mellapak 250.Y, Mellapak 500.Y, and MellpakPlus 752.Y). Experiments were conducted with liquid loads ranging from 5.4 to 48.9 m(3)/m(2).h (2.2 to 20 GPM/ft(2)) and F-factors ranging from 0.61 to 1.65 Pa-0.5 [0.5 to 1.35 (ft/s)(lb(m)/ft(3))(0.5)] in a column with an inner diameter (ID) of 14.6 cm (5.75 in.). The average holdup in Mellapak 250.Y is validated against previous X-ray computed tomography (CT) and pilot plant experiments. Local holdup profiles exhibited a strong dependency on vertical position in the column, generating a periodic profile in the bulk of all packings. The largest values for holdup were observed at the interface (joint region) between two layers of packing. The joint region in MellapakPlus 752.Y exhibited lower holdup when compared to Mellapak 500.Y.