Mueller Tunnel – Mueller Tunnel loop from Allen

If you're looking for a serious challenge on two wheels, the Mueller Tunnel – Mueller Tunnel loop from Allen delivers. This difficult gravel biking route covers 29.0 miles (46.7 km) with a substantial 5625 feet (1714 metres) of elevation gain, typically taking around 4 hours and 38 minutes to complete. It's a demanding ride best suited for experienced cyclists with very good fitness and advanced riding skills, especially given the Mueller Tunnel loop Allen gravel biking difficulty.

What to expect on Mueller Tunnel – Mueller Tunnel loop from Allen

The route offers a journey through varied terrain, from rough dirt tracks and loose gravel to sections of loose shale, especially along the Mount Lowe Fire Road. As you ascend, you'll pass through oak woodlands and chaparral, opening up to expansive views of the Los Angeles Basin and the San Gabriel Mountains; on clear days, you might even spot the Pacific Ocean. The highlight is riding through the historic Mueller Tunnel, a hundred-yard unlit passage blasted through San Gabriel Peak. Expect steep climbs, with some sections reaching grades of 11-15% that might require pushing your bike, demanding focus and bike control.

Planning your visit

This loop is rated as a hard gravel ride, so come prepared for significant effort and technical sections. The route follows portions of the old Mount Lowe Motorway, which can have loose gravel and shale, along with potential rockfalls. Always check local conditions before heading out, especially after rain, as some segments can become slippery or have deep ruts. Ensure you carry enough water and supplies for the full 4 hours and 38 minutes, as amenities are scarce once you start.

Trail details

• Distance: 29.0 miles (46.7 km)
• Elevation gain: 5625 feet (1714 metres)
• Difficulty: difficult
• Estimated time: 4 hours and 38 minutes