The Grottos Loop

The Grottos Loop is a short, family-friendly interpretive trail located in the White River National Forest, situated just off Highway 82 on the west side of Independence Pass. The day-use area stands as one of the valley's most fascinating geologic zones, where the crystal clear Roaring Fork River drops steeply through a boulder field and heavily eroded rock, forming vibrant green pools among the aspens. An extensive network of formal and social trails allows for easy exploration of this scenic area. While the official loop trail is approximately 0.6 miles long, many visitors choose to wander further along the social paths. The route highlights three primary geological and scenic attractions: the Grottos, the Erratics, and the Cascades. The Grottos are polished ice caves and slot canyons carved into ancient bedrock by glacial meltwater. Just past this area, the trail leads to the Erratics, which are two massive boulders deposited by retreating glaciers onto a rounded granite dome known as a whaleback. The loop also provides viewpoints overlooking the Cascades, where the river churns violently through granitic rock. Throughout the journey, hikers can closely observe 1.7-billion-year-old banded gneiss and speckly granite formations.