The Stillaguamish Tribe of Indians used this funding to develop a landslide hazard zonation map to be used as a decision making tool for future land management activities in the Stillaguamish watershed. In 1997, a landslide inventory was conducted throughout the entire Stillaguamish basin (approximately 700 sq/mi). Aerial photography from 1933-1991 was used to determine the number and size of all visible landslides. 1,080 landslides were cataloged (97%) from the North and South Forks. Three quarters of the landslides are associated with forest land uses with 52% originating from clearcuts and 22% originating from roads. Using the landslide inventory as a tool to determine why and where landslide activity occurred previously, a map was developed showing zones of high potential landslide risk for any future land use activity. The map can be used by any agency conducting land use activities in the Stillaguamish basin. Because over 70% of the land use within the basin is forestry, the primary users are Washington Department of Natural Resources, the US Forest Service, and private timber companies. The ultimate goal of the project is to reduce the number of human-induced landslides impacting the watershed.