You could easily spend a day exploring the Columbia River Highway — a winding, narrow old stretch of US 30, that nowadays often appears in car commercials. Along this stretch of road, starting around exit 35 on I-84 (assuming you’re headed west), you’ll pass numerous waterfalls, hiking trails, and gorges. But if you only have time to stop at one attraction, it needs to be Multnomah Falls. This beautiful two-tiered waterfall is the tallest one in Oregon, at 620 feet (when you add together the two drops). It’s also argued to be the second-tallest year-round waterfall in the United States. […]