Tree harvesting methods designed to protect streams from soil erosion and sedimentation can be effective in maintaining water quality, scientists have shown in a study in the Oregon Coast Range. By following rules enshrined in the Oregon Forest Practices Act, research in the Alsea River watershed showed that a stream draining clear-cut slopes carried no more sediment after harvest than before. In fact, the clear-cut watershed had lower sediment concentrations than streams in two nearby uncut watersheds. While the study shows what can theoretically be achieved, researchers are cautious about applying their results to actual harvesting activities elsewhere. The practices in this study may not represent the variety of conditions faced in forest management across the state, they said. For example, no new roads were constructed in the process of carrying out the study.