Olympia oysters (Ostrea lurida) are the only oyster native to the west coast of North America and are considered functionally extinct in many areas, including Puget Sound. While myriad restoration projects for this species exist throughout the coast, most research associated with these projects is aimed at understanding biological metrics of Olympia oysters such as recruitment, dispersal, density, and survival. Despite the presumed importance of this ecosystem engineer, few studies have investigated biological communities associated with Olympia oyster beds and how those communities change in reestablished sites. In order to better understand changes that occur in community composition, with a particular emphasis on salmonid prey, we asked if the reestablishment of Olympia oysters alters the composition of epibenthic communities through time and between or within embayments. Using an epibenthic suction sampler, we gathered 12 samples on and 12 samples off reestablished oyster beds (n=4) in both March and April (when smolts are using these critical habitats) from 2015-2023 depending on the site. All invertebrates samples were processed through 106 μm sieves, preserved, and later identified to the species level (or higher taxonomic categories if necessary) in a laboratory. PERMANOVA results using a Bray-Curtis dissimilarity measure indicated that the epibenthic community composition was significantly different between locations and across years. Additionally, the interaction between location and substrate type (oyster vs. bare) was significant; however, the independent substrate term did not suggest a difference in epibenthic communities between oyster and bare plots. NMDS plots show a dissimilarity of epibenthic community composition between samples and that samples clustered by location, with some clustering based on substrate type within each embayment (Figure 1). This suggests that the main driver of variation between epibenthic communities is actually the embayment. While there was no general independent effect of substrate across all sites (oyster vs. bare), within each embayment the biological communities did vary between oyster beds and bare substrate. This work demonstrates the importance of site specific variation and establishes that ecosystem services provided by this oyster may vary on a localized scale.