The significance of riparian zones for water quality protection and as wildlife habitat is well documented, but little is known regarding the dynamics of greenhouse gases (GHG: CO₂, N₂O and CH₄) in these ecosystems. Flooding events could alter riparian soil moisture regime and nutrient availability, and therefore could have measurable impact on GHG dynamics in riparian soils. Using the static chamber technique, we monitored (biweekly for 6 - 20 months) GHG fluxes at three riparian forests (7 to > 60 y-old) riparian forests along the White River in Central Indiana. The mature forest sites included regularly-flooded and flood-protected areas. Available data showed that, overall, the riparian soils are net CH₄ sink, but the CH₄ sink strength generally diminishes (and in some instances vanishes) during the transition from winter to spring and after flooding events. Nitrous oxide fluxes also tended to be more vigorous following these events. Temporal trends in trace gas dynamics at the study sites will be discussed in light of hydrological data and soil biophysical properties.