As part of the Arctic Long Term Ecological Research (ARC LTER) project, numerous investigators have collected diverse environmental data from sites in the northern foothills of Alaska's Brooks Range. Data collected since 1975 include observations of climate, tundra plant communities and productivity, soils and thaw depth, stream flow, chemistry and temperature of streams and lakes, lake productivity, and nutrient cycling. Research goals include monitoring and predicting biotic responses to climatic change. Data collection was supported by NSF LTER award #9810222. These data are archived at the Arctic Long Term Ecological Research Web site.