If there's certain kinds of books that must be consistently updated, it'd be reference books, especially place references. I keep this book near and dear to my heart because it has great hikes, particularly ones that have small campsites that once the day-hikers go home are quiet and nice. But thee lack of an update is glaring. For example, the Table Rock (Molalla River Valley one) hike has a poor description of how to get there, as rapid growth in the Willamette Valley has changed the roads and towns on the way. Also, the trailhead is now around three or so miles earlier, since the road gave out in 1996. I cannot group this book with the outdated trash though, since it manages to capture a good idea, and also most books overlook Table Rock, period.