Dry deposition is thought to be an important process by which atmospheric mercury is input to ecosystems. However, very little data exists to support this hypothesis. Because of its high solubility and reactivity, dry deposition of reactive gaseous mercury (RGM) is thought to be especially important. There is no standard method to measure RGM dry deposition, and it is often inferred based on air concentrations and assumed deposition rates. In this study, polysulfone cation-exchange membranes were deployed on a seasonal time step in 2005 and 2006 at three locations in Nevada to assess their usefulness at predicting RGM deposition. RGM concentrations were well correlated with accumulation of mercury by membranes (r = 0.92, p <0.001), and not significantly correlated with other atmospheric mercury species (i.e. gaseous elemental mercury and particulate-bound mercury). Calculated vertical deposition velocity of RGM to membranes was high (2.32 ± 1.43 cm/sec), and comparison of membrane deposition with modeled RGM deposition showed a strong correlation (r = 0.90, p <0.001), though deposition to membranes was about six times greater than modeled RGM deposition. Because the reactive membrane surface may not be similar to natural surfaces, deposition of RGM to polysulfone membranes may only provide a broad or “upper-limit” estimate of deposition to ecosystems.