(Corvallis, OR) -- Road building and logging are greater factors in landslides than heavy rain. Research by Oregon State University found clear cutting timber and building roads has a greater impact on how often landslides occur and how severe they are compared to how much water moves through a watershed. They studied the Lookout Creek watershed in Western Oregon over five time periods from 1950 through 2020. There were more landslides when logging was underway than occurred after the logging had stopped.