The project goal is to complete final design of a structure to replace a barrier culvert on Carey Creek, a tributary of Issaquah Creek. The design will be based on the Stream Simulation Culvert or Bridge Design Options in the WDFW Water Crossing Design Guidelines and will account for predicted future conditions of climate change. Products will include secured permits, public outreach, stakeholder coordination, and a construction bid package that contains plans, specifications, and cost estimate based on appropriate engineering and environmental analyses. The culvert is located at 276th Ave SE in unincorporated King County. WDFW has assessed it as 67% passable, with a 1.25-foot water surface drop at the outfall being the primary barrier to fish passage. Removing the barrier will restore fish passage to three miles of high-quality aquatic and riparian habitat supporting spawning, juvenile rearing and cool water refugia. Species benefited include Chinook salmon, coho, sockeye, steelhead, and cutthroat trout. The protected watershed upstream is minimally developed with excellent water quality, large wood accumulations, and an intact forested riparian zone. The replacement structure will also restore natural processes (large wood and sediment transport, some channel adjustment, multi-species passage, etc.) while maintaining channel stability at the crossing. This project will build on previous efforts to enhance and restore this critical headwater in the Issaquah Creek Basin.