The species' habitat is threatened by fire suppression, non-native species invasions, grazing, and agricultural development. Herbicide application for weed control may also pose a threat. The species itself is perhaps fairly resistant to disturbance. However, its natural habitat, in terms of ecological condition, is quite susceptible to grazing impacts (NatureServe 2009). A. sinuatus has been listed as probably present in the Rocky Reach reservoir and project (2000), therefore this population might be threatened by the project.