Pacific salmon returns, including Chinook, chum, and coho, are of enormous cultural, economic, and recreational value for Alaskan communities. In recent years, however, the number of returning salmon in the Arctic-Yukon-Kuskokwim (AYK) region has declined dramatically. Warming water temperatures, mining, and other climactic and human impacts have altered freshwater habitats throughout Alaska, with past land uses, including in-stream mining, disproportionately impacting headwater streams - critical habitat for juvenile salmon spawning and rearing. Understanding, conserving, and restoring these and other freshwater habitats will support efforts to increase the number of salmon returning to the region, but comprehensive habitat data throughout the region is currently lacking. This data gap impairs our understanding of current conditions, which limits our ability to identify restoration needs and have informed restoration targets. By expanding the Bureau of Land Management’s Assessment, Inventory, and Monitoring (AIM) program, researchers at the Alaska Center for Conservation Science and the Alaska Department of Environmental Conservation are providing quantitative baseline data on stream chemical, biological, and physical conditions across the AYK. This data will be used to inform future restoration efforts, support adaptive management decisions, and improve the resiliency of Pacific salmon populations. Additionally, data from this effort will be publicly available through BLM’s public data portal and data analysis tools.