For decades, river restoration in the Northwestern United States followed a simple rule: if you saw logs in the water, take them out. Clean streams were seen as healthy streams, fast-moving water was seen as optimal, and wood was treated like a "barrier" to natural processes, particularly those of the local fish.Now, helicopters are flying thousands of tree trunks back into rivers to undo that thinking.In central Washington, one of the largest river restoration efforts ever attempted in the region is underway. More than 6,000 logs are being placed along roughly 38 kilometers, or 24 miles, of rivers and streams across the Yakama Reservation and surrounding ceded lands.Nearly 40 years ago, Scott Nicolai was doing the opposite kind of work, all in the name of restoration."(Back then) the fish heads — what I call the fisheries folks — we stood on the banks, and we looked at the stream," Nicolai, a Yakama Nation habitat biologist, told Oregon Public Broadcasting. "If we saw a big log jam, we thought, 'Oh, that's a barrier to fish. We want the stream to flow.'" Fish find shelter for spawning in the nooks and crannies of wood. Photo credit: CanvaAt the time, logs were removed in an effort to simplify the habitat. However, it soon became clear that wood provided vital "complexity," creating sheltered pockets for salmon and bull trout to spawn and supporting algae that feed aquatic insects. Logs also slow water, spread it across floodplains, and allow it to soak into the groundwater. That water is then slowly released back into streams, helping keep them flowing and cooler during hot, dry periods.The consequences of removing this "critical part of the system" (in addition to overgrazing, railroad construction, and splash dam logging) were made all too clear over the years as the rivers dried up and wildlife populations declined."We're trying to learn from our mistakes and find a better way to manage," said Phil Rigdon, director of the Yakama Nation Department of Natural Resources.That's why Nicolai is now helping lead a project for the Yakama Nation aimed at rebuilding river complexity by returning logs to their rightful place. Many of these streams are now unreachable by road, which is why helicopters are used. Logs are flown from staging areas and carefully placed at precise drop locations marked with pink and blue flagging tape. Many of these streams are now unreachable by road, which is why helicopters are used.Photo credit: CanvaThe wood comes from forest-thinning projects led by The Nature Conservancy and includes species such as Douglas fir, grand fir, and cedar. Although some of the timber could have been sold, it is instead being used as river infrastructure.For tribal leaders, the work carries even deeper meaning. During the helicopter flights, they gathered along the Little Naches River for a ceremony and prayer. Tribal leaders gathered by the Little Naches River for a ceremony and prayer.Photo credit: Canva"It was very simple: to bring what was rightfully part of this land back to us," said former tribal chairman Jerry Meninick.The aftermath of the original restoration project illustrates how human concepts, such as the belief in the superiority of "cleanliness," can be limited and sometimes cause more harm than good. The miracle of nature, however, is that when left to her own devices, she can heal herself.