Travis Williams has spent a lot of time on the Willamette River. He’s the executive director of the environmental nonprofit Willamette Riverkeeper and the author of the new book “Willamette River Greenways.” The book explores the history of the Willamette River Greenway, a nearly 200-mile corridor of public lands along the river from near Eugene to Portland. Williams joins us to talk about the history and future of the greenway, and what he loves about the Willamette.