Many land reclamation technologies have been used on mining-impacted lands within the Clark Fork River Basin Superfund sites over the past 20 years. Several sites are examples of in-situ reclamation or phytostabilization. Since phytostabilization does not remove metal contaminants, the permanence of this technology as a remedial alternative has received significant scrutiny. Many of these projects have had limited long term monitoring, and as such, the permanence of these efforts is undocumented. However, the continued existence of these sites provides a unique opportunity to evaluate the permanence of in-situ treatment strategies. The purpose of this investigation was to generate sufficient data and information from areas receiving phytostabilization treatments, varying in age from 6 to 19 years, so that the permanence and self-sufficiency of the established and reconstructed ecosystem(s) can be assessed. Six different field sites were selected that represent phytostabilization implementation in different landscape positions, using slightly different equipment, and at different times. The sites are similar in that each was degraded because of impacts from the metal mine/mill/smelter processes. Soils or tailings at the sites contain acid producing materials and are elevated in metal concentrations compared to adjacent, non-impacted landscapes. At each site, neutralizing amendments were added to raise the soil or waste pH to a target level of seven, and at some sites, other amendments were also added. Vegetation response variables observed or measured at the six sites included cover, species richness, evidence of reproduction, evidence of nutrient cycling, evidence of succession, and biomass. Soil response variables measured included pH, acid buffering capacity, and metal concentrations. This paper will present these data and discuss the efficacy of phytostabilization in terms of the sites' ability to sustain current land use and their ability to support other possible land uses. The permanence of the amendments to perform their function of attenuating acid production and immobilization of metals will also be addressed.