Obsidian Dome Loop Road

The route is approximately 9 kilometers (5.6 miles) long and generally takes around 1 hour to complete on a touring bicycle, depending on your pace and how often you stop to explore the unique volcanic landscape.

The terrain primarily consists of firm gravel and dirt roads, often described as doubletrack. However, be prepared for significant sections with deep, sandy pumice, which can be challenging, especially for touring cyclists without wider tires. There are a couple of short, manageable climbs along the way.

While Komoot rates it as 'moderate,' the deep sandy sections can be quite challenging for beginners or those on standard touring bikes. Riders may need to exert significant effort or even push their bikes through these parts. It's more enjoyable for those with some cycling experience and suitable gear.

The main attraction is cycling around the base of the Obsidian Dome itself, a large hill made of black, glassy volcanic rock. You'll also enjoy picturesque views of the surrounding Long Valley Caldera and Mono Craters, showcasing the region's volcanic history. The route is part of the Obsidian Loop Road / Dome road.

The best time to visit is typically during the warmer months when the roads are clear of snow. Always check local weather conditions before heading out, as the area can experience varied weather.

Ample parking is available for the trailhead, which is located west of Highway 395, north of Mammoth Lakes. Look for designated parking areas near the start of the loop.

Generally, no specific permits or entrance fees are required for day-use cycling on the Obsidian Dome Loop Road within Inyo National Forest. However, it's always a good idea to check the official Inyo National Forest website for any current regulations or alerts before your visit.

Dogs are generally allowed on trails within Inyo National Forest, but they must be kept on a leash. Always practice Leave No Trace principles and clean up after your pet.

Given the sandy sections, a mountain bike or a fat bike with wider tires is highly recommended for a more comfortable and enjoyable ride. Standard touring bikes may struggle. Bring plenty of water, sun protection, and basic bike repair tools.

Yes, the Obsidian Dome Loop Road can be part of longer bikepacking routes, such as the 'Basin and Batholith,' which explores the wider volcanic landscape and includes other natural wonders like hot springs. The route also passes through sections of the Obsidian Loop Road (23%), 2S10 (8%), Wilson Butte Loop Road (5%), and Glass Creek Meadow Trail (3%).

The Obsidian Dome was formed by a phreatic blast, an explosive eruption that occurs when magma interacts with groundwater, creating a mountain of solid volcanic glass. Cycling around it offers a unique opportunity to experience this distinctive geological formation up close.