The main byway continues south on US 97 around Mount Shasta, the second-tallest volcano in the country, to the city of Weed, which is marked by a large totem pole that stands off of the intersection of Hwy 97 and Weed Blvd. Along Hwy 97 just north of Weed is Pluto's Cave, a collapsed lava tube that individuals can explore on their own. It then briefly joins Interstate 5, passing Black Butte, before heading east on Route 89 in the city of Mount Shasta and heads on out to McCloud.